Success / Fails With Carpet Dye??

As opposed to remove and replace what are my prospects for dyeing auto carpet in place? Surely some have ventured this. I "think" I want to try the rear seat back and under glass deck of my Barracuda. It's all intact, no tears or pulls, but is faded (kinda' like my hair) to grey, however, I would like to get it back to basic black. Note this is not a show car and not intended to be.
In searching here I've seen some using Rit dye. How does it hold up? Does it transfer to things laid on it after it dries?
So please, share some good and or bad experiences with supply sources you used if available.
TIA

Part of what I'm wanting to dye.............
SeatBack.gif