In printing inks, varnishes, solvents, oily or greasy compounds used to reduce the consistency for printing. In photography chemicals used to reduce the density of negative or positive images or the size of halftone dots (dot etching).
In printing inks, varnishes, solvents, oily or greasy compounds used to reduce the consistency for printing. In photography chemicals used to reduce the density of negative or positive images or the size of halftone dots (dot etching).