On Mon, Nov 16, 2020 at 08:06 AM, Niranjan Patel, wrote:
A question for the chemistry aficionados out there...In all references I have seen, they start with ferrous ammonium sulfate to make ferrous oxalate... Why not plain ferrous sulfate which is easily obtained even at the hardware store?
Buenas Dias, Niranjan
Crystalline ferrous ammonium sulphate hexahydrate is fairly stable towards air-oxidation and loss of water. It stores much better than ferrous sulphate heptahydrate, which slowly effloresces and superficially oxidises, becoming yellow-brown when kept.
BTW, ferric lactate itself is photosensitive, so perhaps you will invent a whole new family of siderotype processes - galactotype.