Speculum Blend
Copper filings and antimony chips, mixed. Smelt it in a furnace into speculum.
kinditemcreative tabFluxion: Materials
Currents
Alloy5
Shift1What the Loupe reads: 6 in all. The game works them out from its recipes. Wheel of Currents
In the Codex
Entry 
Speculum — Copper and antimony — bronze brighter than a mirror. Read copper.
Where to get
Caches
A Fluxionist's Homestead: the workshop, the Honeyfall Grove