Silver baths. After coating your aluminum plate or piece of glass with collodion, you submerge it into a bath of iodized silver nitrate. This is what makes the plate sensitive to light. Silver nitrate stains, hence the look of these baths. #wetplate #wetplatecollodion #tintypestudio #tintype #ambrotype #polaroid #polaroidoriginals #sx70 #film #filmphotography