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even the poor dog is white
Yuck, can't stand white houses. Apparently we have to paint a whole room 40% grey as the mrs is a photographer and that's the most neutral colour.
Should be 18% reflectance if you want half way between black and white. 40% will be way too dark. (Reflectance is logarithmic so mid grey is not 50%.)
Try a few different brands of paint and use "practical tests" (i.e., take some photographs with a calibrated test chart) to check for infrared and ultraviolet reflectance which our eyes won't see but the camera light sensor (or film) might pick up as a red or blue colour cast respectively. Also test under different light sources: daylight, xenon flash, fluorescent and tungsten photo lights.