Ammonium Sulphate is a common fertilizer and a mildly acidic salt that can be used in place of vinegar to drop the ph of brain tanned hides to the slightly acid side before they are brained. This results in a slew of benefits such as easier to brain hides, softer hides and hides that are easier to soften (follow instructions in the new 2nd edition of Deerskins into Buckskins). Ammonium Sulphate is extremely simple to use, virtually fool-proof, and can be safely disposed of on your lawn or garden. You can get Ammonium Sulphate locally, but it often has impurities that make it useless for tanning. One pound is enough for several hides.
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