Re: gum and humidity (was: Measuring humidity)
At 8:06 AM -0700 9/29/06, Katharine Thayer wrote:
(This discussion seems to be ranging across several threads; I pity anyone who tries to follow it later)
Well, I don't see any reason not to confound them since they are both different variables. There is no question but that the RH with the temperature held constant has big effect on sensitivity. This can range from almost no sensitivity at RH of 20% or lower, to very great sensitivity at RH of 90% or higher. However, the oppose it also true. If you hold RH constant and vary the temperature you will have more sensitivity at 90º F than at 50ºF. When I first started printing carbon I carried out testing of this type to help me better understand how to get consistent results, and although I don't have the data any longer, I am reasonably certain the above is correct.