| http://www.w3.org/ns/prov#value | - The multi-ply form or label of claim 1 in which said top and intermediate plies are secured together along three marginal edges thereof by said adhesive to form a pocket, the upper surface of said top ply including at least one area printed with a first composition which, when exposed to a second composition, reacts to form a distinctive color, with at least one of said first and second compositio
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