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Turquoise : Copper. Green : Copper, chrome, ferrous iron, Rinman's green, Guignet's green. Yellow : Antimony oxide, lead (Naples yellow) or potassium antimonite and antimonate, ferric oxide, uranium oxide, sodium uranate, selenium, silver and cadmium oxides, tungsten, molybdenum. Cream : Titania. Violet : Manganese oxide. Brown : Nickel, uranium, rutile, ferric oxide, man- ganese. Vandyke brown is bituminous peat-earth, and Cologne earth is the same calcined. Pink : Chrome-tin colours. Red : Iron - alumina, iron-chrome, iron-zinc colours, sodium- and tin-gold chlorides, purple of Cassius. Black : This may be obtained from 1 part of copper oxide to 1 . 07 of cobalt oxide and 1 . 64 of manganese dioxide, all very intimately mixed. Black is also obtained by reducing organic salts to carbon. Orange : This comes from mixtures of yellow and red. Similarly, a very large selection of colours may be produced by mixing the above stains in various proportions. An artist's wheel is undoubtedly a useful aid in match- ing colours, but it has dangers when working with glazes. A glaze containing say 2 per cent, of copper may be green, and one might think that diluting the stain would produce a lighter green. But probably the result of 0.2 per cent,