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Applying the inks

For flexo and gravure applications, Duncan recommends that an anilox or cylinder of 175 linescreen (maxium) or lower should be used with very good airflow out of dryer ovens. This is because color strength of thermochromic pigments/dyes is low, and because leuco dye particle sizes can run from around 2-10 microns, with liquid crystal particles averaging 10-15 microns. Therefore, application of a higher ink film thickness is required.