It is used to break down hide glue to remove bridge caps, bridges and other such. It is used carefully. Check the label for conventation, it should not be more than 15% or 20% or so. It is costic and corrosive and should be used in a well ventalated space and with limited amounts. This acid is also available in photo supply houses and is used in the making of certain types of prints. Newton nhunt@jagat.com
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