186 I 4 Black Pigments. Substrate

The substrate, which is to be printed upon, is an important criterion for the choice of pigment blacks. Low-structure pigment blacks can achieve a high quality of jetness and gloss on coated papers. High-structure pigment blacks produce higher levels of jetness on uncoated papers. Generally, better results can be expected with coated papers.

Offset inks, letterpress inks

The surface roughness and the absorbence of the printing substrate determine the composition of the printing inks. Inks with a high yield value are suitable for this application where less penetration into the uncoated paper and a greater degree of jetness can therefore be reproduced. Flow properties and structural viscosity can be adjusted according to the structure of the pigments. Pigment blacks with a particle size from 56 nm up to 25 nm are possible.

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