False positive testing device
View Patent ↗A false positive testing device (FPTD) that contains a coating based on a one hundred percent solids varnish and a transparent reagent, that uses oxidative free radical polymerization as a drying mechanism, and that can be transferred to various types of porous substrates by conventional lithographic offset printing and/or dry offset printing. The substrates with the FPTD can be verified by using common currency detection protocols, such as testing with ultraviolet lights and/or counterfeit detection iodine based pen/pad stamps.
1. 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.
2. The assembly as recited in claim 1 , wherein said negative result takes the form of an indiciium selected from the group consisting of a logo, graphic art, an information block, or mixtures thereof.
3. The assembly as recited in claim 1 , wherein said positive result and/or said negative result is a permanent mark.
4. The assembly as recited in claim 1 , wherein said positive result and/or said negative result is a temporary mark that fades and disappears over time.
5. The assembly as recited in claim 1 , wherein said device is comprised of fluorescent chromaphors.
6. The assembly as recited in claim 1 wherein, when said device is exposed to ultraviolet light, said device produces both a positive result and a negative result.
7. The assembly as recited in claim 6 , wherein said positive result is an ultraviolet dull area.
8. The assembly as recited in claim 7 , wherein said negative result is an ultraviolet fluorescent area.
9. A process for applying a false positive testing assembly to a porous substrate, wherein said process comprises:
printing a mixture of fountain solutions (aqueous) and varnishes with a planographic printing plate on the porous substrate to differentiate between non-image areas formed by the fountain solutions and image areas formed by the varnishes respectively, wherein said varnishes form a false positive testing device and include:
a) 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 turns dark/black/reddish brown when marked with a iodide based pen; and
b) daylight invisible, one hundred percent solids, low volatile organic compound, oxidative free radical polymerized varnish excluding said reagent which turns gold/amber/yellow when marked with said iodide based pen, wherein said false positive testing device works irrespective of the reagent concentrations present in the underlying substrate.