Why do some metallic inks have poor rub resistance?

Metallic ink pigments are ground metals and are some of the most difficult inks to formulate for lithography. Metallic inks often do not have good rub resistance and may contain fatty acids to prevent the metal form tarnishing. Consider varnishing metallic inks. Due to the presence of fatty acids, aqueous and UV coating may not adhere to metallic inks. Varnish will adhere to most metallic ink.

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