Crystal identification

I response to a question by Mary Ann Tyrrell about the mysterious red
crystals used as a humidity buffer in a kit, I am quite sure they are
sodium dichromate. I used sodium dichromate for exactly this very
purpose, the RH above the saturated solution is 52-54%. I would suggest
doing a test for dichromates (possibly with Ag+ to form a yellow
precipitate of Ag2Cr2O7?) Hope this helps.

Adam Karpowicz

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                  Conservation DistList Instance 7:39
                 Distributed: Sunday, November 14, 1993
                        Message Id: cdl-7-39-002
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