Tinting a sprite to white leaves it in the same color as the origin image was.
So you shouldn’t see any difference if you tint a normal CCSprite it to white.
You may want to change its color so its more white, but that is not tinting and it’s more complicated.
I guess you could try something with custom shaders (fragment shaders).
I’d have a brighter version (more white) of the image and tint that to black/grey to get the original one.