|Necessity really is the mother of invention...I realised, while working on my latest project, that I could use a Sharpie (waterproof felt tip marker) to mark the notches on the seam allowances, as they were going to be trimmed off anyway. The heavily ribbed fabric that I was using made all other markings very difficult to see. I wouldn't use this type of marker ordinarily, but for this use it was ideal. I have also used the metallic gel "scrapbooking" markers to mark fabric in the seam allowance, when making up a complex Sewing Workshop pattern with lots of non-intuitive matching of parts. I wrote little letters next to the notches. These markings have neither run nor washed out, and I was able to get a very fine line with these, so the letters were really tiny.