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The "Energiatype Process" later called Ferrotype because protosulphate of iron (ferrous sulphate) was used as developer. Invented and communicated by Robert Hunt to The Athenaeum on 1 June 1844, this consisted of the application of a solution of succinic acid to paper, which is subsequently washed over with nitrate of silver.
Store in a tightly closed container. Protect container from physical damage. Store in a cool, dry, ventilated area away from sources of heat or ignition.