Art supplies should be listed by medium, brand where known, colour name or code, quantity, size and condition. Distinguish a single tube from a set, a full sheet from a cut piece, and an open container from a sealed one. State when colours are approximate because screens and lighting vary.
Photograph the actual pigment, paper, brush or tool beside its label, and show any dried, damaged or partly used stock. Do not call a material archival, non-toxic or suitable for a technique unless the maker's information supports it. Keep near-identical shades and sizes in separately identifiable stock records.
Artists may need exact replenishment, so a vague "assorted colours" offer can waste a trip or delivery fee. Update the listing when a shade or pack is sold out. Confirm the final quantity, price and seller-managed handover directly, and do not guarantee how a material will perform in every project.
