Most formulations of the collodion for wet plate process contained cadmium bromide or cadmium iodide, Today, Environmental awareness, We try Scully & Osterman 2013 Salted collodion Formulations containing cadmium bromide as the control group, with potassium bromide, Sodium bromide and ammonium bromide and other bromide to replace cadmium bromide, adjust the formula of collodion, and the actual shooting and measuring the gray scale guide table in the image, compare the experimental group of salt collodion acclimated tone performance, The potassium bromide ammonium iodide formula that the performance of very fine even t better than cadmium iodide formula, but its poor storage, without long-term storage under the premise of wetplate process enthusiasts can modulate the use of fresh potassium bromide ammonium iodide salted collodion to replace cadmium bro-mide collodion harmful to the environment and the human body.