Carbon paper stain
Apply a cloth with carbon tetrachloride, laying down a folded towel, which will absorb the dissolved dye. When the solvent has evaporated, wet the stain and rub in a little detergent. Lightly wash down; rinse under cold running water. Launder as usual.
Fabrics that are not washable must be dry cleaned. At home, you can try to put a cloth with carbon tetrachloride on an absorbent pad. First do this on the wrong side of the fabric, so that the dissolved dye is absorbed by the foundation. The foundation itself has to be changed frequently, so that the dye does not go back to the fabric.