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Contents
How do you make granulating watercolor?
I often brush a little water on the paper, then add the watercolor mixed with more water. This allows the particles to float until the heavier particles clump and do their thing on the paper. One method to force granulation is to add a lot of water to your pigment, then go back and charge your wash with more pigment.
What is granulation fluid?
The granulation liquid (fluid) contains a solvent or carrier material which must be volatile so that it can be removed by drying, and depending on the intended application, be non-toxic. Typical liquids include water, ethanol and isopropanol either alone or in combination.
How does granulation medium work?
First, we show how Granulation Medium works with Alizarin Crimson, a colour which does not have a naturally granulating quality. It separates the colour and allows the pigment to settle into the surface of the paper with a textural quality. When used with a naturally granulating paint, this impact is even more obvious.
Is yellow Ochre granulating?
Daniel Smith
Daniel Smith’s yellow ochre appears the warmest, earthiest of the three; its has a strong orange cast yet it’s not offensive. Like most DS pigments, the granulation is very apparent but not so much so that I found it difficult to control.
Which colours are granulating?
This type is usually given the name “French Ultramarine” and is used when a strong granulation effect is required. Other typical examples of granulating colours are Cobalt Blue & Cobalt Green, Cerulean Blue, Raw Sienna, Green Earth, Gold Ochre and Oxide Black.
Is Prussian blue watercolor granulating?
Other blues that I know of that granulate are Verditer Blue, Mayan Blue Genuine, Lunar Blue, Lapis Lazuli, Prussian Blue, Cerulean Blue, Azurite, Manganese Blue Hue, Blue Apatite Genuine and Sleeping Beauty Turquoise.
Is burnt umber granulating?
Granulating paints also separate when mixed with other colors and do wonderful things. A few of more frequently used granulating colors would be Cerulean and the Ultramarine blues, as well as Raw Sienna, Burnt Sienna and Burnt Umber.
Which granulation method is best?
Among these two techniques, wet granulation is the most widespread granulation technique used despite the fact that it involves multiple unit processes such as wet massing, drying and screening, which are complex, time consuming, and expensive requiring large space and multiple equipment.
What are granulating agents?
A granulating agent provided proper moisture to convert fine powder into damp mass ,which after passing through a sieve of suitable number forms granules. The various granulating agents used are water,alcohol,mucilage of starch,mucilage of acacia ,mucilage of tragacanth,gelatin solution,iso-propyl alcohol,acetone etc.
Why is a tablet binder necessary for granulation?
Tablet binders are one of the most essential elements in the formulation of a tablet. Because they promote cohesiveness, the binders, also called adhesives, help the other ingredients in a tablet to mix together. Tablet binders are used to turn powder to granules; this is achieved through the process of granulation.
Can you use granulation medium with acrylic paint?
Creating texture using granulation medium & acrylics inks
The other technique that I’ve used in many of my watercolour & mixed media paintings over the years is using acrylic inks diluted with granulation medium.
How do you make a watercolor binder?
- 8g of gum arabic.
- 16g of distilled water.
- 8g of glycerine.
- 1g of honey.
- 3 drops of clove essential oil.
What is in watercolor granulation medium?
Granulation within watercolour is a specific characteristic to certain pigments whereby the pigments clump into granules on the paper when applied as a wash. This is naturally occurring with some pigments and is not a sign of low quality paint.
What are the methods of dry granulation?
- Slugging technique. …
- Roller compaction. …
- Weighing formulation ingredients. …
- Mixing of formulation ingredients. …
- Compression of mixed powders into slugs. …
- Milling and sieving of slugs. …
- Mixing with disintegrant and lubricant. …
- Compression of granules into tablets.
How much water do you use for wet granulation?
The obligatory use of a granulating liquid during wet granulation generates large granules during the wet massing and kneading stages. The typical amount of water used in the formulation is 20–50% of the weight of the dry powder mixture.
How granules are formed?
√ The granules are formed by the following methods: solid bridges, sintering, chemical reaction, crystallization, and deposition of colloidal particles. √ Granules are formed from the powder particles by wetting and nucleation, coalescence or growth, consolidation, and attrition or breakage.
How do you do wet granulation?
- Step 1: Weighing and mixing of formulation ingredients (excluding the lubricant). …
- Step 2: Preparing the damp mass. …
- Step 3: Wet screening/ Screening the dampened powder into pellets or granules. …
- Step 4: Drying of moist granules.
DIY Granulation Medium | Create Special Watercolor Effects using Household Ingredients – YouTube
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All you ever wanted to know about Watercolor Granulation – Watercolor Affair
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- Most searched keywords: Whether you are looking for All you ever wanted to know about Watercolor Granulation – Watercolor Affair Updating Have you ever noticed how watercolor paints behave differently ? Some colors produce a smooth even wash, but others seem to have a life of their own, creating amazing textured patterns. When you play around with watercolors for a while you’ll soon notice this interesting aspect of watercolor painting. Don’t worry, there’s nothing wrong with
- Table of Contents:
Granulating pigments
Granulation on watercolor paper
Which watercolors granulate
List of Daniel Smith granulating watercolors
Watercolor granulation medium
How to get granulation effects with watercolor
Are your watercolors granulating
Conclusion
Watercolor Paper Weight Explained (Find Out What’s Best)
Watercolor Supplies Beginners Guide (This is What you Truly Need)
Gifts for Watercolor Artists (What to Get an Artist for Christmas)
Are Watercolors Toxic (The Truth about Toxic Watercolor Pigments)
Granulation – Wikipedia
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Contents
From powder[edit]
From solids[edit]
See also[edit]
References[edit]
Sources[edit]
External links[edit]
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Granulation Medium for Watercolour | Winsor & Newton
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DIY Granulation Medium | Create Special Watercolor Effects using Household Ingredients – YouTube in 2022 | Watercolor effects, Art friend, Art lessons
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- Summary of article content: Articles about DIY Granulation Medium | Create Special Watercolor Effects using Household Ingredients – YouTube in 2022 | Watercolor effects, Art friend, Art lessons 3 UNBELIEVABLY EASY DIY Envelopes! Use What You Have To Make Your Own Envelopes! Simple and FUN! …
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All you ever wanted to know about Watercolor Granulation – Watercolor Affair
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- Summary of article content: Articles about All you ever wanted to know about Watercolor Granulation – Watercolor Affair Granulating watercolors produce delicate textures because of the … to granulating medium, my best advice is to try creating your own … …
- Most searched keywords: Whether you are looking for All you ever wanted to know about Watercolor Granulation – Watercolor Affair Granulating watercolors produce delicate textures because of the … to granulating medium, my best advice is to try creating your own … Have you ever noticed how watercolor paints behave differently ? Some colors produce a smooth even wash, but others seem to have a life of their own, creating amazing textured patterns. When you play around with watercolors for a while you’ll soon notice this interesting aspect of watercolor painting. Don’t worry, there’s nothing wrong with
- Table of Contents:
Granulating pigments
Granulation on watercolor paper
Which watercolors granulate
List of Daniel Smith granulating watercolors
Watercolor granulation medium
How to get granulation effects with watercolor
Are your watercolors granulating
Conclusion
Watercolor Paper Weight Explained (Find Out What’s Best)
Watercolor Supplies Beginners Guide (This is What you Truly Need)
Gifts for Watercolor Artists (What to Get an Artist for Christmas)
Are Watercolors Toxic (The Truth about Toxic Watercolor Pigments)
Jane Blundell Artist: Granulation – what and why?
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- Most searched keywords: Whether you are looking for Jane Blundell Artist: Granulation – what and why? … texture as well as the colour of my subject, and granulating pigments helps to create texture in the otherwise 2D watercolour medium.
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All you ever wanted to know about Watercolor Granulation
Have you ever noticed how watercolor paints behave differently ? Some colors produce a smooth even wash, but others seem to have a life of their own, creating amazing textured patterns.
When you play around with watercolors for a while you’ll soon notice this interesting aspect of watercolor painting.
Don’t worry, there’s nothing wrong with your paint !
One of the most beautiful characteristics of watercolor is the surprising textures it can produce. And granulation is one of the traits that adds incredible texture.
You’ve probably heard watercolor artists discussing granulating paints (sometimes referred to as flocculating or sedimentary watercolors).
But what is a granulating watercolor ?
Watercolor granulation results from the type of pigments used in the paint formula. Some pigments tend to cluster together creating uneven mottled washes. Granulating watercolors produce delicate textures because of the characteristics of their pigment particles.
Personally I like the expressiveness produced by this effect. The subtle textures created by granulation is something unique to watercolors !
Some watercolor artists prefer smooth even colors and do all they can to avoid granulating paints. Others exploit this effect to produce beautiful dappled effects in their artwork.
Whatever your preference, this is a characteristic worth getting to know !
Granulating pigments
Pigments are the basis of the color appearance in our watercolors.
In the past, artists used organic substances to provide pigments for their paint. These natural pigments are the origin of some of the poetic paint “names” we recognize today, (names such as Alizarin, Sepia, Gamboge etc.).
Today the majority of pigments used in paint are man made (known as synthetic organic pigments).
Many synthetic organic pigments form clumps during manufacturing. These clumps can be broken down by milling before the pigments are made into paints, but not all pigments are equally as easy to grind. As a result the size and shape of pigments varies slightly from one paint to another.
As a general rule, small fine pigment particles will produce less granulation, and these watercolors produce a flat and smooth painted surface.
Larger, heavier, irregularly sized pigments will cause more granulation and these can bring about some wonderful mottled textured effects.
Obviously, given the vast range of different paints, the size and shape of pigments is changeable from one tube of paint to the next. As a result the degree of granulation differs quite a bit.
Granulation on watercolor paper
When you lay down a wet watercolor wash, at first the color pigments are suspended in the water of the fluid paint. As the water evaporates, the pigments settle onto the paper. Granulating pigments are heavier than non-granulating pigments, and so they sink into the paper under the influence of gravity.
The mottled textures of granulation can be observed on all types of watercolor paper. On smooth hot-pressed paper the pigments tend to do as they please and move around randomly until all the water evaporates. On cold-pressed or rough watercolor paper the dispersion of pigments is slightly more even, and the pigments tend to fall into the low crevices and valleys of the rough paper surface.
Remember, you can vary your choice of paper according to the effect you’re trying to achieve.
Which watercolors granulate ?
As you’ve probably gathered by now, whether or not your watercolors granulate depends very much on the type of pigments which comprise the paint. But the brand and grade of paint can also influence the amount of granulation, since the formula varies a lot between manufacturers.
You will also find that cheaper, student grade watercolors will granulate less because their paint formula tends to contain less pigment (pigments are expensive, so lower quality paint uses less of them).
But generally speaking, certain colored pigments have more sedimentary qualities than others.
For example, finding red and yellow hues that granulate is really hard. Whereas blues and purples, have a good range of granulating colors.
Below is a list of some common granulating watercolors (non exhaustive).
Granulating blues
Finding blue sedimentary colors is pretty easy. A lot of the generic paint names of artist quality paint use the same pigment in their paint formula, but it is worth checking to be sure.
French Ultramarine is probably one of the most commonly used warm blues and is very granulating. Ultramarine Blue falls into the same category.
Granulation
Granulation is the process of forming grains or granules from a powdery or solid substance, producing a granular material. It is applied in several technological processes in the chemical and pharmaceutical industries. Typically, granulation involves agglomeration of fine particles into larger granules, typically of size range between 0.2 and 4.0 mm depending on their subsequent use. Less commonly, it involves shredding or grinding solid material into finer granules or pellets.
From powder [ edit ]
The granulation process combines one or more powder particles and forms a granule that will allow tableting to be within required limits. It is the process of collecting particles together by creating bonds between them. Bonds are formed by compression or by using a binding agent. Granulation is extensively used in the pharmaceutical industry, for manufacturing of tablets and pellets. This way predictable and repeatable process is possible and granules of consistent quality can be produced.
Granulation is carried out for various reasons, one of which is to prevent the segregation of the constituents of powder mix. Segregation is due to differences in the size or density of the components of the mix. Normally, the smaller and/or denser particles tend to concentrate at the base of the container with the larger and/or less dense ones on the top. An ideal granulation will contain all the constituents of the mix in the correct proportion in each granule and segregation of granules will not occur.
Many powders, because of their small size, irregular shape or surface characteristics, are cohesive and do not flow well. Granules produced from such a cohesive system will be larger and more isodiametric (roughly spherical), both factors contributing to improved flow properties.
Some powders are difficult to compact even if a readily compactable adhesive is included in the mix, but granules of the same powders are often more easily compacted. This is associated with the distribution of the adhesive within the granule and is a function of the method employed to produce the granule.
For example, if one were to make tablets from granulated sugar versus powdered sugar, powdered sugar would be difficult to compress into a tablet and granulated sugar would be easy to compress. Powdered sugar’s small particles have poor flow and compression characteristics. These small particles would have to be compressed very slowly for a long period of time to make a worthwhile tablet. Unless the powdered sugar is granulated, it could not efficiently be made into a tablet that has good tablet characteristics such as uniform content or consistent hardness.
Two types of granulation technologies are employed: wet granulation and dry granulation.
Wet granulation [ edit ]
In wet granulation, granules are formed by the addition of a granulation liquid onto a powder bed which is under the influence of an impeller (in a high-shear granulator), screws (in a twin screw granulator) [1] or air (in a fluidized bed granulator). The agitation resulting in the system along with the wetting of the components within the formulation results in the aggregation of the primary powder particles to produce wet granules.[1] The granulation liquid (fluid) contains a solvent or carrier material which must be volatile so that it can be removed by drying, and depending on the intended application, be non-toxic. Typical liquids include water, ethanol and isopropanol either alone or in combination. The liquid solution can be either aqueous based or solvent-based. Aqueous solutions have the advantage of being safer to deal with than other solvents.
Water mixed into the powders can form bonds between powder particles that are strong enough to lock them together. However, once the water dries, the powders may fall apart. Therefore, water may not be strong enough to create and hold a bond.The binding of the particles together with the use of liquid is a combination of capillary and clinging forces until more permanent bonding is established.
States of liquid saturation in granules can exist; pendular state is when the molecules are held together by liquid bridges at the contact points. Capillary state occurs once the granule is fully saturated. Filling all voids with liquid, while surface liquid is pulled down back into pores. Funicular state alteration linking the pendular and capillary where voids are not fully saturated with liquid. Liquid assist in binding onto the particles which become distressed in a tumbling drum. In such instances, a liquid solution that includes a binder (pharmaceutical glue) is required. Povidone, which is a polyvinyl pyrrolidone (PVP), is one of the most commonly used pharmaceutical binders. PVP is dissolved in water or solvent and added to the process. When PVP and a solvent/water are mixed with powders, PVP forms a bond with the powders during the process, and the solvent/water evaporates (dries). Once the solvent/water has been dried and the powders have formed a more densely held mass, then the granulation is milled. This process results in the formation of granules.
The process can be very simple or very complex depending on the characteristics of the powders, the final objective of tablet making, and the equipment that is available. In the traditional wet granulation method the wet mass is forced through a sieve to produce wet granules which are subsequently dried.
Wet granulation is traditionally a batch process in the pharmaceutical production, however, the batch type wet granulations are foreseen to be replaced more and more by continuous wet granulation in the pharmaceutical industry in the future. The shift from batch to continuous technologies has been recommended by the Food and Drug Administration.[2] This continuous wet granulation technology can be carried out on a twin-screw extruder into which solid materials and water can be fed at various parts. In the extruder the materials are mixed and granulated due to the intermesh of the screws, especially at the kneading elements.[3]
Dry granulation [ edit ]
The dry granulation process is used to form granules without a liquid solution because the product granulated may be sensitive to moisture and heat. Forming granules without moisture requires compacting and densifying the powders. In this process the primary powder particles are aggregated under high pressure. A swaying granulator or a roll compactor can be used for the dry granulation.
Dry granulation can be conducted under two processes; either a large tablet (slug) is produced in a heavy duty tabletting press or the powder is squeezed between two counter-rotating rollers to produce a continuous sheet or ribbon of material.
When a tablet press is used for dry granulation, the powders may not possess enough natural flow to feed the product uniformly into the die cavity, resulting in varying density. The roller compactor (granulator-compactor) uses an auger-feed system that will consistently deliver powder uniformly between two pressure rollers. The powders are compacted into a ribbon or small pellets between these rollers and milled through a low-shear mill. When the product is compacted properly, then it can be passed through a mill and final blend before tablet compression.[4]
Typical roller compaction processes consist of the following steps: convey powdered material to the compaction area, normally with a screw feeder, compact powder between two counter-rotating rolls with applied forces, mill resulting compact to desired particle size distribution. Roller compacted particle are typically dense, with sharp-edged profiles.[5]
From solids [ edit ]
Plastic granulation and pelletizing line; extrusion, cooling, and cutting
In plastic recycling, granulation is the process of shredding plastic objects to be recycled into flakes or pellets, suitable for later reuse in plastics extrusion. In the first stage, plastic objects to be recycled are fed to an electric motor-powered cutting chamber, which continually cuts the material using one of several types of cutting systems. Some systems use a scissor-like cutting motion, chevron or V-type rotor helical rotor or fly knives.[6][7] The material is ground into all the smaller flakes until they became fine enough to fall through a mesh screen. In wet-granulation lines, water is continually sprayed in the cutting chamber to remove the debris and impurities, and acts as a lubricant of the steel blades; in dry-granulation lines, water is not present, but such technology generally produces output of lower quality than the wet technology.[8] While the process is relatively simple, it must be carefully parametrized, as the high temperatures resulting from friction can damage the material and affect its plasticity. Regular maintenance and sharpening of the scissor blades are essential, as well as close monitoring of the process due to potential clogging and jamming.[9]
In many cases, granulation may be the only step required before the plastics can be reused for manufacturing of new products. In other, the new or recycled plastic material must be remade into pellets. The material is molten and extruded into thin rods, which are then cooled in a water tank and finely chopped into small cylindrical pellets.[10]
See also [ edit ]
References [ edit ]
Sources [ edit ]
Handbook of Pharmaceutical Granulation – 3rd Edition, Editor – Dilip M. Parikh
Pharmaceutics – The science of dosage form design – M. E. Aulton 2nd EDT
Pharmaceutical dosage forms and drug delivery system – Loyd V. Allen, Nicholas G. Popovich & Howard C. Ansel 8th EDT
Lachman leon, Industrial pharmacy, special Indian edition, CBS publishers
Granulation Medium for Watercolour
Granulation Medium for Watercolour
Granulation Medium for watercolours can create unique effects, as we will show here, but you may not know that common table salt can also be used for stunning effects. First, we show how Granulation Medium works with Alizarin Crimson, a colour which does not have a naturally granulating quality. It separates the colour and allows the pigment to settle into the surface of the paper with a textural quality. When used with a naturally granulating paint, this impact is even more obvious. Next we show how common table salt, when sprinkled on a wet watercolour surface, can create beautiful speckled effects as the salt sucks in the water and leaves the pigment to settle into the surface of the paper. Then we show how rock salt works in the same way but creates more extreme textured effects. Finally, masking fluid is flicked off of a brush, allowed to dry and covered over with a wash. When the paint is dry, the salt is brushed off and the masking fluid rubbed away to reveal the textured, starry effects left behind by the salt and the sharper, distinct shapes revealed by the masking fluid. Both techniques offer you interesting opportunities in your painting!
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