I had a good result on a cream carpet a few weeks ago with chemspecs helpmate, I think there new product dyegone works in the same way
but the lady hsd put a red persion wool rug, just a small hearth rug in front of the sofa, when she moved the rug the dye had trsnsfered onto the cream carpet, I did try rinsing the carpet and used sodium met but got no joy, I went back and used some helpmate which is ideal for dye stains, anyway it came out completely
stuart