I also had the problem of the marker tenure on black cloth. I "grilled" a canvas black Aida DMC and not gone away. I washed by hand, machine, to the cleaners but nothing, the sign remains visible. In the end I got just that the fabric is sbiadisseRating: [1 of 5 Stars!]
Hello :-) Sorry for this problem, but we take advantage of this message to remind you that with this type of water marker, one must always pay some attention. For example, one should never iron the fabric before you have taken off the scoring and always advisable to do a test on a small area of the fabric, to see the \ "reaction \", we say so. In addition, the markings should never be left on the fabric for too long. Best wishes.