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If you are diluting 95% ethanol that came in plastic drums from a reputable supplier like Pharmco, then in the absence of specimens the only thing that can cause discoloration is something in your water. That's more chemistry than I learned in school, but my
guess would be metals (iron, perhaps, or copper). <br>
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If the ethanol was clear before dilution, then unless it was somehow contaminated to start with it's not going to be the source of the issue.
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"When you eliminate the impossible, whatever remains - however improbable - must be the truth" (attrib. S. Holmes)</div>
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<div style="font-family:Tahoma; font-size:13px"><b>Paul Callomon</b><br>
<i>Collection Manager, Malacology and General Invertebrates</i><br>
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<font face="Verdana"><b>Academy of Natural Sciences of Drexel University, Philadelphia</b></font><br>
<i>callomon@ansp.org Tel 215-405-5096 - Fax 215-299-1170</i><br>
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