Recently i've been looking more into the scientific side of dyes and tannins, as well as inorganic and organic pigments. Inorganic pigments are the crystals of metal oxides.
Here is what i've found out:
INORGANIC PIGMENTS:
Chromium oxide green:
Usually known as chrome green, this pigment can be found in lead chromite. In the past, it was used as enamel in porcelain, which then was used as a painting pigment.
http://www.naturalpigments.com/chromium-oxide-green-pigment.html
Originally comes from the stone lapis lazuli, and originates from Afghanistan.
https://www.google.co.uk/search?q=Mixed+metal+oxide++pigment&newwindow=1&client=firefox-a&hs=m0J&rls=org.mozilla:en-US:official&channel=fflb&source=univ&tbm=shop&tbo=u&sa=X&ei=8XJiVPTHEbiAsQTH0IKADg&ved=0CCIQsxg&biw=1280&bih=564
Link above for ways to buy these pigments. A lot of them are on Etsy! These pigments do come in all sorts of colours, including pinks, purples, oranges, and yellow.
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