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The clover white pen is terrific for marking any of your dark fabrics. I almost took mine back to the store thinking it was faulty, and lucky I am a whinger sometimes, because I whinged about it to a fellow quilter and she quickly informed me that it takes a while for the white mark to appear. Lesson learnt : Whinging can save you some embarrasment
It goes on clear then changes to a nice fine white line and this line is easily removed with a quick iron over. Do not, I repeat, do not have the iron too hot as you may melt any wadding underneath (and anyway only a low heat is required). I know, cause I've done it! It sure leaves a flat spot on the quilt! It is great for marking your applique pieces for needleturn applique also.