It's good to have all the information on these pens then everyone can make their own informed choice. I for one LOVE my frixion pen. I use the black alot on small sewing projects. I use it to mark quilting lines on potholders, a perfect 1/4 inch seam line on some patterns, darts and hatches on sewing patterns etc. I have used it to mark applique placement on a wallhanging and quilting lines. I won't be using it on a full size quilt. I have other methods for marking my tops or I freeehand quilt them. I figure better safe than sorry but as I said, "make your own informed choice."