chemistry of paint: where does paint come from?
DESCRIPTION
Chemistry of paint: Where does paint come from?Adaptable for High School or University level.Deliver this short lecture midway through an "Intro to Painting" lesson.TRANSCRIPT
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What’s inside this paint?What gives paint its color?
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If you wanted to make your own paint, what
would you need?
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First, an ingredient to give the paint colour. This is called a pigment.
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Some pigments start as minerals or gems, and are ground into powder.
(This is true cobalt blue, which comes from an expensive gemstone in Africa. 4 oz. of cobalt powder costs $215 USD, or $250 SGD)
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Some pigments start as rocks or clays.
(This is burnt sienna, which comes from a certain soil in Italy. You bake it in a furnace, hence BURNT sienna, and you grind it up.)
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Some pigments come from ground-up plants (or even juices from animals).
(This is sap green, which comes from ripe buckthorn berries. Sap green is common, cheap, and has been around for hundreds of years.)
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Some pigments are made in a laboratory from chemicals. These are the newest pigments.
(This is cadmium red, which comes from a mixture of cadmium sulfide and cadmium selenium. Scientists have been making this artificial colour in labs since the 1920s.)
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These pigments can make oil, acrylic, or watercolor paints, but they can also
make pastels or colored pencils.
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Also, these pigments are never exactly red, blue, or yellow.
Instead, a pigment might be a dull reddish orange or a greyish
blue-green, or a bright blue-violet.
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Do you recognize any of the colours here? If you start with a few, you should be able
to mix the rest.
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So to make paints, the first ingredient you need is a pigment.
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The other ingredient you need is called a binder, or vehicle.
the first ingredient you need is a pigment
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Linseed oil + Pigment = Oil paint
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Acrylic Binder + Pigment = Acrylic paint
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Review from last week:Do you remember the three
differences between oil and acrylic paints?