Author: Anlg
How to obtain:
Secret dye rolls from secrets in the catacombs. Only secret chests can roll for secret dye. If you open a chest with a terminator or sneak, you will still get the dye. If your inventory is full, it will be sent to stash.
Secret dye has a base 1/1,000,000 chance to drop.

Method:
If you only want secret dye, make dungeon routes that only get chests because the dye will not roll from other secret types. It is best to grind floor 7 secrets and start a new run when either the floor is cleared of chest secrets, or you have to backtrack a lot to get to new rooms.
If you still want to complete dungeon runs, it is best to do floor 5 because it has a short boss fight. You will want to play either berserker or tank because they clear rooms the whole run.