In another preferred embodiment of the invention the adhesive used to adhere the indicator dyes to the transparent cover film is an alkyl acrylate/acrylate acid adhesive prepared with less than about 4 percent by weight, {HEAD ~ preferably less than about 2 percent} by {TAIL ~ weight} of acrylic acid, preferably formulated as a comonomer, to about 96 99 percent by weight of an alkyl acrylate such as isooctyl acrylate in the adhesive, i.e., the weight percent ratio of acrylic acid to isooctyl acrylate in the adhesive is the range of about 1 4:96 99 
by
In another preferred embodiment of the invention the adhesive used to adhere the indicator dyes to the transparent cover film is an alkyl acrylate / acrylate acid adhesive prepared with less than about 4 percent by weight , { HEAD ~ preferably less than about 2 percent } by { TAIL ~ weight } of acrylic acid , preferably formulated as a comonomer , to about 96 99 percent by weight of an alkyl acrylate such as isooctyl acrylate in the adhesive , i.e. , the weight percent ratio of acrylic acid to isooctyl acrylate in the adhesive is the range of about 1 4:96 99
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