I have used the Frixion pen in black to mark my embrodery lines for my quilt labels and quilting lines on one of them. The fabric was all white and the iron took out all the lines. I love the fine line they make. I am told that they might return at 14 degrees but not many of us will be putting our quilts in the freezer nor will they be going to places where they will be exposed to that temp. Since I wash all my quilts before they leave then I shouldn't have to worry about that anyway, right RoseL?