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Can you make purple watercolor paint by boiling purple-colored thistle flowers?

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No, if you boil thistle flowers at 212°F, the resulting solution will turn light brown.

It makes okay light brown water-color paint

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  • Have you tried extracting without the boiling?
    – rebusB
    Commented Mar 27 at 16:55
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    There are a lot of articles on natural dyes, such as this Wikipedia page but none mention thistles. Some colours just aren't stable enough. Safflower is a yellow thistle that produces a nice yellow dye, but it prefers much warmer weather than Scotland.
    – Stuart F
    Commented Apr 25 at 9:55

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