Paint contains:
- Pigment - gives the paint its colour
- Binding medium - liquid that carries the pigment bites and holds them together. When it turns to solid, it sticks the pigments to the surface you've painted.
- Solvent - keeps the binding medium and the pigment runny - as a liquid in a tin or paste in a tube.
Paints are colloids:- a colloid consists of really small particles of one kind dispersed into a another kind.
The particles can be bits of solid, droplets of liquid or bubbles of gas.
Colloids don't separate because the particles are so small.
Emulsion paints > water based. The solvent is water, binding medium is a polymer such as acrylic.
Gloss paints > oil based. Binding material is oil, the solvent is an organic compound such as turpentine.
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