Patent ID: 8371616

Claim:
A false positive testing assembly comprising: a false positive testing device disposed on a porous substrate, wherein said device comprises a) a first section including transparent, daylight invisible, one hundred percent solids, low volatile organic compound, oxidative free radical polymerized varnish doped with a transparent reagent, wherein said reagent is present in the range of 10% to 30% by weight of said device, wherein said reagent chemically reacts with a redox solution to form a visible colored moiety on said substrate, and b) a second section including transparent, daylight invisible, one hundred percent solids, low volatile organic compound, oxidative free radical polymerized varnish excluding said reagent, wherein said first section provides a negative result and turns dark/black/reddish brown when marked with a iodide based pen, and said second section is contiguous to said first section and provides a positive result and turns gold/amber/yellow when marked with said iodide based pen, and wherein said false positive testing device works irrespective of the reagent concentrations present in the underlying substrate.