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binder

By Shelley Esaak, About.com

Definition:

(noun) - A binder is the agent in paint that serves - on the molecular level - to make the paint stick to the support (that is, the canvas, board, or what have you).

For example, the binder used in watercolor and gouache is gum arabic. Tempera - real tempera - uses egg. Acrylic paint uses acrylic as its binder. And oil paints use - you guessed it! - some sort of drying oil, usually linseed or a modified oil called an alkyd. It's great, the way chemistry works in paint - even if one (raising hand) doesn't necessarily understand chemistry!

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