----- Original Message ----- From: <editor@xxxxxxxxxxxxxx> : some white materials have fluorescent in their makeup (to make them whiter), which would then "pollute" your color balance. : Grey is "safer" that is all. True, but there's as much error with white, grey or black when the object is an opaque surface, as grey paint is 'made' and has wild variations in colour.. as has black. Tests I've done with selections of white grey and black swatches under a densiometer have always given a wide variation in colours. Best bet is to find *one* that produces acceptable colours for the user and keep it safe :) karl