Artcraft Chemicals in NY carries these and other chemicals for the collodion process (as well as many other processes). The quantities of these salts used in the process are very small. For example, one formula that I've used contains 3 gm of cd bromide and 4 gm of potassium iodide in a final collodion solution of about 500 ml. And 500 ml of collodion goes a long way. Anyone getting into wet plate collodion should first educate themselves thoroughly on the hazards and proper handling of the chemicals involved and make judicious use of the proper personal protective equipment.
Originally Posted by Donald Qualls