product brief introduction:
the prints of the watermark ink have the same effect as watermark paper. Under the sun, we can see a clear pattern of the watermark. Because of low-cost and the watermark don't need dedicated machines to identify, so it is widely used in the printing documents and brochures.
screen and offset
offset -white watermark : 1kg ink can be printed about 6000 sheet of paper
screen-white watermark: 1kg ink can be printed about 1200 sheet of paper
screen-black watermark: is printed between two pieces of carbon paper or printed on the black of paper if the paper is single- side