A gelatin that has been treated with bromine compounds, historically used in photographic emulsions and printing processes.
From bromo- (bromine-containing) + gelatin (from French gélatine, from Latin gelare meaning to freeze). Developed in the late 19th century for photography.
Before digital cameras, bromogelatin plates and films were the secret sauce behind professional photography—the bromine made gelatin sensitive to light, allowing photographers to capture images on chemical emulsions.
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