C1h - Paints and Pigments
- Created by: Lauryn Nigh
- Created on: 10-02-16 18:01
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- C1h - Paints and Pigments
- Ingredients of paint
- Binding medium, sticks the pigment in the paint to the surface
- Solvent, thins the paint and makes it easier to spread
- Pigment, a substance which gives paint its colour
- Oil paints
- The pigments despersed
- Often contains a solvent which dissolves the oil
- Thermo-chromic pigments
- They change colour at different temperatures
- Used as visual thermometers
- Used in the manufacture of cups - colour shows when how hot it is and whether its safe to hold
- Used in electric kettles to keep users safe when using boiling water
- Used in babies food and bath toys to indicate if the drink or bathing water is too hot
- Thermo-chromic pigments can be added to acrylic paints to make an even more colour change.
- Phosphoresce pigments
- This special pigment is much safer than the older alternative of radioactive paints
- Often exposure to radioactive substances mostly results in cancer
- These pigments glow in the dark
- They glow in the dark because: - they absorb and store energy - they release the energy as light over a period of time
- This special pigment is much safer than the older alternative of radioactive paints
- Paint is a colloid, this is where particles are mixed and dispersed with particles of a liquid (binding medium) but are not dissolved.
- Components of a colloid will not separate due to the particles are too scattered throughout the mixture whilst being very small and do not settle at the bottom
- How do paints dry?
- Most paints dry because: - Paints are applied as a thin layer - the solvent evaporates
- Emulsion paints are water-based paints that dry when the solvent evaporates
- Oil paints dry because: - the solvent evaporates - the oil is oxidised by atmospheric oxygen
- Most paints dry because: - Paints are applied as a thin layer - the solvent evaporates
- Ingredients of paint
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