濕板攝影術(Wet Plate Process) 發明已經一百六十多年,是讓影像廣為流傳的重要里程碑,但後來因乾板攝影術的發明而逐漸沒落,僅剩少數攝影藝術家使用,現今流傳的濕板攝影用鹽漬火棉膠配方中大多含有溴化鎘或碘化鎘成分,在環保意識抬頭的現代,嘗試以含有溴化鎘的Scully & Osterman 2013 鹽漬火棉膠配方為對照組進行實驗,以溴化鉀、溴化鈉與溴化銨等溴化物取代溴化鎘,調整火棉膠配方,並實際拍攝與測量畫面中的灰階導表,比較各種實驗組鹽漬火棉膠的階調表現後,得知溴化鉀碘化銨配方火棉膠的階調表現相當優良,不會比對照組的溴化鎘碘化鉀差,惟其保存性較差,在不進行長期儲存的前提下,濕板攝影愛好者可以少量多次的方式調製新鮮的溴化鉀碘化銨鹽漬火棉膠使用,以取代對環境及人體有害的溴化鎘。
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.