01
Rust settles first — Cortinariaceae
A clay-brown deposit, dense at the hub and thinning toward the rim, brackets the genus before any cap colour is recorded.
02
White only reads on dark — Amanitaceae
Amanita spores disappear on cream stock. The near-black mounting board is the test, not a style choice.
03
Purple-black narrows fast — Strophariaceae
Stropharia and Psilocybe drop a violet-tinged black that separates them from the true blacks of Coprinus within one print.
04
Pair the prints, then key — Method
Two contrasting papers per specimen, mounted side-by-side, let all three deposit families read at once on a single card.