Colour as a dated substance. Each pot is a first-use, a chemistry, and a verdict: still on the palette, replaced, or locked in the poison cupboard. Swatches are screen approximations ā never a spectrophotometer.
Dates follow conservation literature (Eastaugh et al., Pigment Compendium; Gettens & Stout). āFirst useā is the earliest well-attested artist or industry use, not the mineralās existence. Toxicity notes are historical, not COSHH sheets.