Re: Measuring humidity
Katherine, Temperature certainly is a variable, but my home is 70 degrees year round and it's the humidity that can vary a lot. Humidity has a LOT of influence—at least with PT/PD. But then, as you say, I am holding my temperature constant—and wearing the same lucky undershorts. Best Wishes, Mark Nelson Precision Digital Negatives - The System PDNPrint Forum at Yahoo Groups www.MarkINelsonPhoto.com In a message dated 9/28/06 7:58:11 PM, kthayer@pacifier.com writes: But apparently I'm not the only one making this mistake, because we've all been using RH as if it were a meaningful variable, and obviously it's not, unless, as you say, temperature is held constant. The graphs in the literature showing the relationship between humidity and dark reaction, and humidity and sensitivity, were no doubt constructed holding temperature constant. Unfortunately they don't say that, or specify the temperature, although I suppose we could assume 25C, isn't that the usual standard temperature?
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