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The Art of Mixtures

The Art of Mixtures. By: Jennings Bryson, Suzanne Hodges & Kyle Oldham. What Makes Paint a Mixture. Paints are a type of mixture called a colloid. Paint contains several components, including the pigment, a solvent, a binding medium, and additives. Paint Ingredients.

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The Art of Mixtures

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  1. The Art of Mixtures By: Jennings Bryson, Suzanne Hodges & Kyle Oldham

  2. What Makes Paint a Mixture • Paints are a type of mixture called a colloid. • Paint contains several components, including the pigment, a solvent, a binding medium, and additives.

  3. Paint Ingredients • Pigment - gives the paint its color • Binding medium - a liquid polymer that hardens to form a continuous layer when the paint dries • Solvent - dissolves the binding medium and makes the paint more fluid. • (polymer: a large molecule) • Additives- small amounts of substances modifying the paint properties

  4. Physical Change • Emulsion paints are water-based. Their solvent is water, and it dries when the water evaporates. • Physical change

  5. Chemical Change • The pigments in oil paints are dispersed in oil, which may itself be dissolved in a solvent. • The solvent evaporates away when the paint dries. This leaves the pigment and oil behind. The oil oxidises to form a hard film. • This happens because the oil reacts with oxygen in the air. • Chemical change https://www.youtube.com/watch?v=Qc5snqAR8cI http://www.bbc.co.uk/schools/gcsebitesize/science/ocr_gateway/carbon_chemistry/paintsrev1.shtml

  6. Chemical or Physical • Is mixing two different colors of paint a chemical or physical change? • It is a physical change because mixing the two paints does not make a different substance, it simply makes a different color. http://www.substech.com/dokuwiki/doku.pjp?id=composition_of_paints http://www.bbc.co.uk/schools/gcsebitesize/ocr_gateway_pre_2011/rocks_metals/1_paints_pigments2.shtml

  7. Oil Paint Facts • Most oil paints are undercoats or primers that will always come in a metal can • The paint itself is flammable because it contains petroleum distillates(paint thinner) • The vapor it gives off, volatile organic compounds, VOCs, can be very dangerous.

  8. Oil Paint facts cont. • Extra fact: • Before 1978, many paints’ pigments contained so much mercury, that the neurotoxins were harmful to developing children, the adult brain, nervous system, and virtually every organ. • Now, the danger of the mercury or VOCs subside after the paint dries. • www.dejeronimopainting.com

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