Ferrous Sulfate a developing agent used in wet plate photography.
Wear safety glasses and nitrile gloves when handling. IMPORTANT: Refer to material's safety data sheet (SDS) for additional safety and handling information. Use of this material is strictly at your own risk.
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From practical observation of the development process, we know that developing agents are able to reduce a latent photographic image to metallic silver
Because the wet-plate lab deals with a wide variety of potentially hazardous materials, the first order of business is to learn about the materials, their hazards, and how to handle them safely.