i got a normal sword with a white color name and i cant dye it silver...i dyed my other sword tats purple silver, altho it turned out to be no different.
I personally haven't tried dying weapons, but maybe the type of weapon affects what parts of it change color. Maybe something about it makes it really unnoticeable.
you could dye your weapons in beta... i don't know when they took it out, but i really liked it, gave your char that extra bit of customizing, of course you can still dye them, and they will change color on your doll in inventory, but in game they wont change
It all depends on the weapon.
The wooden or handle parts of weapons will dye. The metal parts do not. (You can't dye metal anyway! Tinting the alloy is done at creation not by covering it in paint!)