I’ve heard people say that titanium white and zinc oxide pigments work so well in metalpoint grounds because they are themselves metals. To be clear: Titanium and Zinc are metals (which can, incidentally, be used to draw with in metalpoint). However titanium white and zinc oxide are inorganic, mineral-based pigments, but not actual metallic compounds – correct? I believe they work well in metalpoint grounds because of their relative hardness (6.5 and 4.5 respectively on the Mohs Scale), yes?
They are both metallic compounds and inorganic pigments. Elemental zinc and titanium (cand silver and copper and gold) are metals proper. Additionally, silver nitrate is a metallic compound but not a metal nor a pigment in that form.
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