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Updated: May 7, 2025
Apply a gentle heat, and soon the spots disappear, leaving the impression clear and free from all organic matter. In the absence of cyanide of potassium, a solution of pure hyposulphite of soda will answer as a fair substitute. To Redeem, a Solarized Impression. The Daguerreotype plate, prepared in the ordinary manner, should be exposed in the camera a sufficient time to solarize the impression.
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