we dyed wool with gobaishi, a japanese gall that is created on japanese sumac (i think...it was a little complicated and hard to understand in japanese!!) with just alum and gobaishi, it didn't really change the color too much, but with iron, it turned a lovely heathery purple.
the gobaishi galls 
boiled for an hour in a mesh bag, they turned mushy
into the pot with iron added
the outcome.if anybody out there knows more about gobaishi, i'd love to hear from you!
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