Do you need to use pure white/black dyes?
I have my retainers out constantly and get them so rarely that there is no way I want to waste them on throw away gear. Nor do I want to spend up to 700k on a pot of dye for throwaway gear.
If SE wants up to use pure dyes instead of regular dyes, coupled with the rarity of them, they are definitely trying to encourage cash shop sales which is a step in a dangerous direction and this game is just another doa gold saucer game for me.