The three layer paper consisted of gelatine-paper where a layer of baryta had been deposited between paper and gelatine in order to reflect light and to isolate the paper from the emulsion.

• 此三层纸包含凝胶纸，其中氢氧化钡层已在纸和凝胶中间沉淀，如此可反射光以及将纸从乳胶中隔离出来。