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TheLoucheyMonster!

Journal of the Franklin Inst. 1829

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I think I have seen this referenced here in the forums in French, but here it is published in English in 1829.

 

LINK

 

An interesting section is the part about coloration methods, and the desire for a lasting, stable green color.

 

One method describes the use of a tincture made of indigo, sulfuric acid and 'carbonate of lime' ; and then add carthamus (safflower) "we obtain all the varieties of green which we can possibly desire".

 

I have seen other references to indigo before, but not carthamus.

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