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I had high hopes for this... but... i used on Liberty quilting cotton weight fabric to mark out the quilt pattern. I had to wash it twice with stain remover to make it disapear. Its still visible in places so back to the uv pen.
Nice convenient method of marking dark fabric. The pen leaves a narrow line and doesn’t need sharpening. You can see how much chalk is in it so that a refill can be ordered in time. The marks brush off the fabrics when you are finished.