Alley in Pisa, Italy

by Lars Kotthoff

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I forgot to label the bag and now it's been 6 months and I can't remember which chemical it is. They are both fine white powders. I know the fixer smells pretty strong so I suppose I could put some in water and see if I can smell it. Any better ideas?

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I would use the taste test. Just kidding. –  dpollitt Oct 6 '11 at 0:33

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Since developers are often alkaline, you could use a red or purple litmus paper to test for that - if it contacts with alkalies, it turns blue.

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or just mix up a small batch and rub it between your fingers. The alkaline solution should have a slightly "soapy" feel to it :) –  jwenting Oct 6 '11 at 6:59
    
If you don't have litmus paper, put a drop of vinegar on a tiny amount of powder and see if it fizzes. do this in a well-ventilated area, just in case. –  AJ Finch Oct 6 '11 at 9:30

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