Penniman-Zoph


Penniman-Zoph :

A process for making a yellow iron oxide pigment. Hydrated ferric oxide seed is added to a solution of ferrous sulfate and the suspension circulated over scrap iron, with air being passed through. Hydrated ferric oxide deposits on the seed crystals, giving a finely divided, yellow pigment: 4FeSO4 + 6H2O + O2 = 4FeO•OH + 4H2SO4. (Check source for accuracy of chemical formula)

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