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Old 23-05-11, 01:24 PM
dbclemons dbclemons is offline
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Join Date: Mar 2006
Location: Texas
Posts: 231

Originally Posted by EllenT View Post
...You mention alum. Maybe this is a dumb question but what is that?
I can try that question. Alum is aluminum sulfate made usually from potasium or ammonia. It works as an estringent or flocculant, meaning it causes the solids in water to squeeze together more tightly. This helps in the water-proofing aspect and hardness of gesso. Ammonium aluminum sulfate is the type often recommend for use in hide glues. You can often find it in the spice section of a grocery store since it's often used in baking or pickling. There's a brand called McCormick that is made from ammonia which I could recommend. It's also used for water treatment of pools or in ceramic glazes. After the glue has gelled, add just a pinch of alum to the water you'll be thinning the glue with.
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