These samples had the longest drying cycle I had ever seen. It has been rainy and damp and sunless the last few days. We live on a mountain, so when it is cold and rainy, we are actually in a cloud and our relative humidity has been running at about 65%. The slides sat on the windowsill for a day and a half before they dried out, so I expected some unusual formations.
Citric Acid
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Citric Acid
Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA
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