A description of tannic acid can be found at the Bookbinding and the Conservation of books site. 

Wear waterproof gloves when handling the tannic acid solution, it will stain your skin black.

Formula for Tannic Acid Solution

• 300ML ethyl alcohol
• 2 liters of distilled water
• 400 grams Tannic Acid powder

Tannic Acid Supplier

I've found some suppliers would rather deal with purchase orders on company letterheads, but this one didn't require any of that.

Rose & Co, Inc.

Manchester, Connecticut  USA  06040
(phone number pending)

Other Substances

Ethyl alcohol can be purchased at a good hardware store. Distilled water of course can be found a supermarket.

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