>> In the summertime [the humidity in our laboratory] is at around  
>> 60-70%, which seems to work well. In the winter time it is less  
>> than 0 and I run a humidifier full out to try to achieve 20%.<<

If your relative humidity is less than zero, you're probably putting
too much thiotimoline in your water bath!

(If you're too young for this literary allusion, see
http://en.wikipedia.org/wiki/Thiotimoline
) and make the acquaintance of the late great Isaac Asimov!

Bob Richmond
Samurai Pathologist
Knoxville TN

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