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If a solute does not dissolve in a particular solvent it is
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...…read more

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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 out using
turpentine or white spirit because the paints are insoluble
in water
Emulsion paints
These are water-based paints so brushes can be cleaned
They generally give a matt finish and are used on…read more

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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
Anti-corrosion (anti-rust) pigments
1.…read more

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Thermochromic materials change colour at specific
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 cause a
change in colour
Other uses of temperature strips, warning of hot cup or
The principle
At normal temperature the pigment
appears coloured, but at 27 C the colour
e.g.…read more

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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 a small paintbrush. The painted
surface should be left to dry in a warm place, when the
colour-change affect will become apparent even before
drying is complete.…read more


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