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Mixtures

When a solute dissolves in a solvent a solution is formed
The particles of the solute are so small they are invisible;
the solution is transparent

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If a solute does not dissolve in a particular solvent it is
insoluble




However is the particles of the insoluble substance are
very, very, very tiny they remain suspended in the solvent
and a colloid is formed




Oil paints

This is the type of paint used for woodwork ect... to…

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The medium binds (sticks together) the pigment particles in
the dry paint
The solvent thins the paints and evaporates to leave the
paint film




The oil of the binding medium also oxidises (combines with
oxygen and air) to form a harder film
Brushes used for oil paints must be washed…

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Pigments

Although pigments are generally used to make colour, they can
also be used to give the paint other properties:
Hiding powder
Phosphorescent pigments (make them glow in the dark)
Thermochromic pigments (changing colour with
temperature)
Anti-corrosion (anti-rust) pigments

1. Colour

Pigments and dyes used to be made from natural…

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2. Thermochromic

Thermochromic materials change colour at specific
temperatures
Typically, they are incorporated into a special ink and
printed onto plastic films to create thermometers or
temperature indicators
e.g. If the battery is in good condition, current
flows through a printed resistor under the
thermochromic film and heats it to…

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Using the thermochromic pigment

It's a good idea to begin by creating a test /
demonstration strip on paper or plastic sheet (e.g. a thin
walled plastic cup). Mix a small amount of pigment into
the acrylic base and dilute with water, if necessary, so it
can be applied with…

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