(Special eco-bonus: gum bichromate prints are "developed" using only water. No developer, no stop, no fixer, no toner.)
That the reader has basic skills with PhotoShop, Gimp or some other photo editing software is assumed. The purpose of this document is to explain in almost painful detail exclusively how to perform the printing portion of the process, although rudimentary information is provided, since it is vital in explaining portions of the methods used.
That the reader is skilled in working with potentially dangerous chemicals and understands the risks associated with such activities is also assumed. Warning: dichromates are poisonous and should not be ingested. Raw dichromate crystals look like orange-colored sugar but can be lethal. Be smart.
This is the starting image of carabiners used for the demonstration: the raw image with the exception of its being scaled to 1000 pixels on the long side @ 72dpi. No other changes have been made. Total eye candy.
For the camera technoids: original 3Kx2K image produced using Nikon D50 with 100mm Sigma macro @ f8 and Nikon SB-60 flash (-1 EV) with hood on Bogen 3021/3047 combination, but that's only so much nonsense.
(Yeah, yeah...so what's the deal with the process being called a bIchromate but the photoreactive chemical being used is a dichromate? At some point during its golden age, major discoveries were made in molecular chemistry, leading to a sort of unification amongst international chemistry unions regarding naming conventions. Chemically, bichromates were dead in favor of the much zippier dichromate. Photographers decided simply to ignore the chemical name change and stick with the deeply rooted bichromate. (Trivia! Get your trivia heeyuh!)