it has a big yellow spot on the carpet now..
Of the three previous answers, I'd go with the Rit dye. Just make sure you dilute it well, and apply a small amount at first to see the results. Apply a second, or third coat if necessary to get the desired color. Also, you could try blending it out into the carpet that was not ruined for a cleaner blend between the two. Good luck!
I've told people a thousand times, keep the bleach in the laundry room. It is not only dangerous to get in the eye, but it will permanently damage any fabric it comes in contact with, outside the laundry room, that is. Call a store that sells carpeting to locate a person who can come out to your home and replace the damaged carpet. A piece of replacement can be obtained, quite possibly, from a closet. A similar color and texture can then be fitted into the closet.
There's really nothing you can do. If you have any carpet left over, or can buy a small amount from a dealer.. You can cut around the stain and replace the carpet. You'll have to get special carpet tape (It's a sticky rubbery substance on both sides with strings in it.) and a carpet iron (Basically how it sounds. You plug it into the wall, it gets hotter then a clothing iron would and it melts the two pieces of carpet together.) to do it. But if you do it right, no one will notice a seam in the carpet. There's no way to dye it because the dyed carpet will never look like the original carpet.
