The ISO50 Field Guide to Color Management An additional step you can take to ensure ideal lighting conditions in your workspace is to paint the walls with Munsell 8 Gray. This paint is specially formulated to have a flat spectral response with no color bias. Unlike other hues, this type of gray will not affect your perception of other colors in the spectrum. It creates a “pure” and neutral viewing environment. You may have noticed this color on the wall of photo studios and print shops.