Wet And Reveal Screen Ink
This is a water based screen ink which dries to give a white opaque print. When wet the ink film takes up water and becomes transparent allowing any print beneath to become visible. If the water dries out the opacity is regained and the original white print is restored.
A fairly heavy print is required, which essentially means the ink is supplied as a screen ink. More than one print may be required to obscure an underlying print. As the coating weight of wet & reveal ink is increased the transparency when wet can be reduced so careful tests should be carried out to determine optimum printing parameters. Careful choice of underlying text / patterns can help by selecting something that will be easier to hide.
Wet and Reveal Screen ink can be printed on various substrates such as paper, cards, print receptive plastics and even textiles. Tests should be carried out to determine suitability for the substrate and application chosen.
When a highly permanent print on textiles is required the dried wet and reveal print can be crosslinked by baking for 3 – 5 minutes at 130ºC.
Good results have been seen with prints on absorbent substrates without additional curing but if a crosslinked film is desired, but temperature treatment is not an option because of the choice of substrate, then chemical crosslinking agents such as aziridine may be employed.