Electrod47,
CFE powders only claim to keep copper fouling from building up (what rubs off bullet jackets and onto the bore) (a source of accuracy problems over a long course of fire). Nothing clean was ever claimed for the powder's own combustion products. If you want to see what a clean-burning powder looks like, see if you can find some Trail Boss and try a few loads in new brass with that. It's only for reduced loads, but I've had new bulk 45 Auto cases loaded with it that eject with no sign anything was burned in them either inside or out. Just bright, shiny brass all around.