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If you added things like quartz powder, ground glass or any type of glittery material to your painting, wouldn't it then be a mixed media painting instead of an oil painting? At what point do we consider something a painting or just arts and crafts?
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Well Marta why do you say this? After all what is oil paint? Oil ether linseed or almond oil added to a pigment.
What are these pigments? Well some are ground oxides of metals like titanium, lead and chromium. Or cadmium is a chemical element which is found in zinc, copper, and lead (reason cadmium colors often contain a warning of lead content).
Some are just earth iron-rich for Ochre and Sienna or iron and manganese for Umber
Others like alizarin come from crystalline compounds of coal tar, or it