I only use chalk with no oils on tops. I have used those blue pens and other things but only to mark a sewing line that won't be seen on the top. Learned my lesson years ago when a so called disappearing marker showed up after washing and ruined the top. Not a good thing.
Try a white/cream piece of fabric and use different markers. If it's a blue marker print those words etc.
Then wash, iron and do all the thing that the pkg says will cause it to disappear.
Then press with hot, steam, and even spray with water to see what happens.
Last edited by tuckyquilter; 11-13-2019 at 11:35 AM.