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Ross

I believe the answer is:

alum

(Other definitions for alum that I've seen before include "Sulphate used in dyeing and tanning" , "Compound used in tanning and dying" , "Name given to a specific chemical compound and a class of them" , "Sulphate; maul (anag.)" , "White mineral salt used in medicine and in dyeing" .)

I've seen this clue in The Wall Street Journal.
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