Those inks have the particularity to react to water, hypochlorite, bases at 5%, acids at 5%, ink killer pens, Ethanol Benzene 50/50, Oxydoreductor, Sodium sulphite, Glycol Ethers and Alcohol. The effect is a discoloration or a colour alteration.
They are mainly used for the printing of the background of bank checks, shares and so on. In this case when forgers try to modify document by washing them, the printed part will bleed and the forgery will be immediately discovered.
Fluorescent properties can be added to those inks.
Due to their specifications, those inks can only be printed in dry offset, letterpress and flexography.
The colour density of those inks is not very high because the dyes used for manufacturing them allow only pastel shades.