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Old 09-09-15, 08:05 PM
marknatm marknatm is offline
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I know the thread has been dead for awhile, but I think you may want to contact natural pigments to determine what they do to produce their lapis. I'm pretty sure that Kremer (who produces Fra Angelico Blue as well as Ultramarine ash) uses the traditional method described by Cennini to procues these products. Ultramarine ash is what is left over after the third extraction.

I would also suggest that Master Pigments does the same type of extraction. I believe that they even have a youtube video showing how the extraction is performed.

My experienc has been that given how fine lapis and azurite work due to their minerality you need to approach their use in thinner apllications.

Mark
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