Rit, All Purpose Liquid Dye, Charcoal Grey, 8 fl. oz.

This stuff is powerful- now be sure to follow the instructions, for natural fiber, you add a cup of salt to the dye, and you would be surprised what fibers count as 'natural' as far as dye is concerned, so ask co-pilot or whatever. They do make a synthetic fiber dye as well. This is also good to deepen or have a muted effect on brighter color but by all means don't use the whole bottle. Like say you buy the 'wine' color and it's a little too fuschia or reddish purple , add a capful to the dye.. Being an old 'goth' I have loads of black clothes and have occasionally messed them up with random bleach or something else, this has saved me from having to throw stuff out and also refreshed black clothes that get dingy. Better to use it in a metal sink or hardware store paint bucket- somewhere you arent worried about staining. I don't think I would use this in a white bathtub for instance.