MadSci Network: Chemistry

Re: What is powdered tempra paint made of?

Date: Mon Jan 6 11:52:27 2003
Posted By: Keith Allison, , dept: New Product, Technology & Development, Binney & Smith, Inc. (Crayola)
Area of science: Chemistry
ID: 1039725116.Ch


Powdered paint formulas are really just paint formulas without the liquid 
ingredient, namely the water.  Typical formulas contain the following 
solid ingredients:

pigment (to provide the color)
clay (thickens the paint when water is added)
"binder" (a polymer that forms a film when it dries, typically corn starch 
or dextrin)
preservative (powder that will destroy any bacteria or mold that is 
"filler" (extra solid stuff added to give the paint some volume and does 
not serve any particular purpose otherwise, such as calcium carbonate or 
another clay, etc.)

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