This section is from the book "Paint And Varnish Facts And Formulae", by J. N. Hoff. Also available from Amazon: The Industrial And Artistic Technology Of Paint And Varnish.
Cadmium Yellow, Or Sulphide Of Cadmium is made by combining some salt of cadmium with sulphur. It varies from pure yellow to orange red, and is a fairly permanent pigment.
Barium Chromate is a pure yellow, having good working qualities and is the most permanent of the chromates used in paint.
Ultramarine Green is a modified form of ultramarine blue. Its use is limited to water colors in frescoing and similar work.
 
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