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C3.4.2 Paints, dyes and pigments

C3.4.2 Paints, dyes and pigments. Paints, dyes and pigments. describe the uses of transition metals and their compounds in pigments and dyes. describe the aspects of safety, sustainability and effects on the environment of pigments and dyes. Paints, dyes and pigments.

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C3.4.2 Paints, dyes and pigments

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  1. C3.4.2 Paints, dyes and pigments GCSE Chemistry Extension Module C3.4

  2. Paints, dyes and pigments • describe the uses of transition metals and their compounds in pigments and dyes • describe the aspects of safety, sustainability and effects on the environment of pigments and dyes GCSE Chemistry Extension Module C3.4

  3. Paints, dyes and pigments Many transition metal compounds are coloured and soluble in water: However, not all are soluble and so don’t form solutions: GCSE Chemistry Extension Module C3.4

  4. Paints, dyes and pigments Soluble transition metal compounds that are coloured can be used as... DYES Insoluble transition metal compounds that are coloured can be used as... PIMENTS GCSE Chemistry Extension Module C3.4

  5. Paints, dyes and pigments The fabric that is boiled with a solution of the dye. The dye makes chemical bonds with the fabric. Sometimes strong bonds are not made and another chemical is added to make them bond – this compound is called a mordant. GCSE Chemistry Extension Module C3.4

  6. Paints, dyes and pigments The dyes were obtained from either animal,vegetableor mineral origins, with no or very little processing. Archaeological evidence shows that, particularly in India and the Middle East, dyeing has been carried out for over 5000 years. The greatest source of dyes has been from the plant kingdom, notably roots, berries, bark, leaves and wood. GCSE Chemistry Extension Module C3.4

  7. Paints, dyes and pigments The greatest source of dyes has been from the plant kingdom, notably roots, berries, bark, leaves and wood. e.g. woad – used by Ancient British tribes e.g. henna – a traditional dye GCSE Chemistry Extension Module C3.4

  8. Paints, dyes and pigments Natural dyes tend to be limited in their range. In the 19th century a compound called aniline was found to be a source of brightly coloured dyes. The source of the aniline was coal and is now oil. These artificial dyes need far more processing in their manufacture. GCSE Chemistry Extension Module C3.4

  9. Paints, dyes and pigments ‘Spodden Valley, Rochdale - exposed waste has been photographed at Greenbooth in adjoining woodland. The bright blue contamination appears to be dyeing waste.’ ‘Last night’s meeting heard of the types of cancer-causing chemicals associated with sites once involved in industrial bleaching, dyeing work.’ 23.11.2005 GCSE Chemistry Extension Module C3.4

  10. Transition metals GCSE Chemistry Extension Module C3.4

  11. Paints, dyes and pigments GCSE Chemistry Extension Module C3.4

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