Is there anything out there that treats bleach damage to 100% cotton black clothing?!?

There is a dye you can purchase at the store. I believe it is called Rit, I bought it but used a marker instead. I've had the same thing happen to a long sleeve black shirt. It wasn't too big so I used a permanente black sharpie to color it in. It didn't look 100% back to normal but close enough.