Boundary
Do not identify material from colour or shine; do not infer real wearability.
Complete source
Fictional costume studio: a shiny star drawing is labelled made-paper model; a separate foil scrap has an aluminium package label. The star has no material certificate.
Invitation
Choose which statement belongs to which object and put a source label next to it.
Next try
Offer a dull-looking supplied aluminium drawing and ask what a label can establish that appearance cannot.
Ordinary possible response
The model star is paper in the source; the labelled scrap is aluminium. Shine alone does not identify either.