Crush 5 herbs to create pigments for making inks. This will destroy the herbs in the process.
Milling, a sub-skill of Inscription, is used to make pigments from herbs which can be obtained via the Herbalism skill. Five herbs of the same type are consumed per milling attempt and produce 1-4 pigments, with the most common result being a single pigment milled. Higher level herbs may also occasionally produce rarer pigments.
Similar to Prospecting, the type of herbs that can be milled for pigments scales up with Inscription skill level.