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the chemistry of water color paint

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Shelby Isaacs

on 6 June 2014

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Transcript of the chemistry of water color paint

Start by drawing on dry paper with a wax crayon.
Then, use your watercolor paint to paint over the wax.
Due to the wax's hydrophobic properties, it repels the water molecules and keeps its own designs.
This happens because the wax is nonpolar and does not dissolve in polar water.
The chemistry in the water and the watercolor paints allows for many textural reactions.
We explored the reactions between the watercolor with 3 different agents:
Each of these agents showed interesting effects due to their individual properties.
Work Cited
In commercially made watercolor paints, the binder is either natural gum arabic or synthetic glycol
This is what holds the pigment in suspension.
It also allows the pigment to adhere to the medium (paper) once it is applied.
Salt absorbs moisture (because of its soluble properties) while repelling pigments, creating a texture.
Salt is sprinkled on a wet wash and starts to gather the watercolor pigments.
The wash has to be still wet but not too shiny.
The effect will vary depending on the size of the grains of salt and the wetness of the paper.
"Watercolor Texture Techniques" http://hatefueled.deviantart.com/art/Watercolour-Texture-Techniques-146824155
"Textural Effects for Watercolor Painting" http://www.fountainstudio.com/watercolor%20tips/tip-texture_effects.html
"Common Watercolor Techniques" http://www.watercolor-painting-tips.com/watercolor-techniques.html#AlcoholTextures
"How Watercolor Paints are Made" http://www.handprint.com/HP/WCL/pigmt1.html
"Water Drops: Cohesion and Adhesion Forces" http://www.appstate.edu/~goodmanjm/rcoe/asuscienceed/background/waterdrops/waterdrops.html
"The Stuff of Paint" http://www.watercolorpainting.com/pigments.htm
"More Watercolor Painting Techniques and Effects" http://www.watercolorpaintingandprojects.com/techniques/more-and-effects.html
shelby isaacs and haylee schwartz
Watercolor is a painting method in which the paints are made of pigments suspended in a water-soluble vehicle
Pigments provide the color just as in other paint mediums
The proportion of pigments in paint, relative to other ingredients, can vary widely from under 10% to over 50%
Gum arabic is water-soluble gum produced by a species of the acacia tree and is available in crystalline form or in prepared solutions.
The gum arabic crystals or granules are transparent when pure, but less highly refined varieties can be yellowish to honey colored.
Unlike drawing and printmaking papers, watercolor paper contains sizing, which reduces the absorption of paint into the paper itself. The pigments remain on the surface of the paper, so the colors remain brilliant.
Paint pigments dissolve in rubbing alcohol. Therefore, alcohol, when sprinkled into a wet wash of color creates a texture.
When alcohol is sprayed onto the wet pigment, it causes a "foam" appearance and is great when painting water that is rushing over rocks, ocean waves.
When it is applied to dry paper, and then the paint is applied, it seems to leave dark spots on the page.
the chemistry of watercolor paint

Advantages Include:
Easy Clean-Up
Relatively Cheap
Less Paint Wasted
No additional harsh chemicals besides the actual pigment
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