Chemical Forums
Chemistry Forums for Students => Inorganic Chemistry Forum => Topic started by: JWP on December 01, 2005, 07:51:40 PM
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I am looking into the chemistry behind blackening brass and would like to know whether the black/gray colour observed on the brass is copper sulphide, oxide or is it perhaps a sulphide from the solution precipitating on the surface?
The solutions used are as follows:
1. Sodium thiosulphate + Lead Acetate
2. Sodium thiosulphate + Iron (III) Nitrate
Can anyone provide me with the chemistry for this process?
Thanks
Ian