Rosin and talc, both of which are applied to dry the greasy drawing material prior to processing the image/stone. Rosin is generally applied at the stage of the second etch to help dry the ink a little and create a little bit more durability/acid resistance. The talc is applied whenever gum will be applied to the greasy drawing areas (either when the image is still in it’s original drawing-material state or once the drawing materials have been replaced by ink) to allow the gum to flow more evenly and not pool.
