I know some people want to make their toons pretty ’n all and buying Abyss dye for all your toons are expensive. How about the idea of a colourless dye that you need to apply to ANOTHER dye and it will become that colour. Now, before you say “it will destroy the dye economy/make Abyss dye cheap, etc.” let me explain how this works:
1). Imagine you have Abyss dye in one toon, and you want it on another toon.
2). You found/bought the colourless dye.
3). You duplicate your Abyss dye.
4). That dye is now account-bound and can no longer be sold.
5). You can apply the new Abyss dye to another toon.
This prevents item duplication but at the same time, allows you to transfer/copy whatever dye you want from one toon to another.
Just an idea. Ideas are cheap, they come out of our kittens.