sebass said:tell me about his test
g_axelsson said:You should have a known gold solution (or a solution of the metal you are testing for) to verify your stannous is working. Put that beside the solution being tested to compare if you are uncertain.
If you still have oxidizers in your solution the reaction could be a temporary ones and the color disappears in a short while.
Read http://goldrefiningforum.com/phpBB3/download/file.php?id=16976 and do some experiments.
Göran
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