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Barry: <While the test prints were in the window, the control prints were in another room on a shelf in an unsealed envelope. The room temperature and humidity were virtually identical.> Yes, but not the display temperature. That would be much higher. One way some people handle this is to put the controls on the display and cover them with foil (NOT black tape). Depends on what you're trying to control for. <The temperature of a test print in the sun is extremely difficult to control and would vary as function of how dark the test patch is.> Good point. And another reason not to do sunlight tests. <I did a crude test to see how temperature affects yellowing. Put some samples in the oven on the lowest setting for a few hours and they did yellow....> What kind of oven? <KIDDING> Look forward to your yellowing tests. Harald Johnson http://groups.yahoo.com/group/digital-fineart - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.