Ferric Chloride solution is a corrosive salt for etching.Now widely recognised as the safest and best perfoming etchant for copper plate, especially when used in conjunction with citric acid to make 'Edinburgh Etch' (© F.K. 1997).
Baume Hydrometer Glass 250mm 0-70 Degree For Ferric Chloride Solution Testing
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Red IRON (III)OXIDE rust powder | ferric oxide | High grade oxide powder
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Silver Nitrate 12% Solution - 100ml - Salt Print Sensitiser - Bexhill Darkroom