There are sooo many different marking pens out there that it is hard to remember which one disappears with what technique: air, water, heat, etc. I put a mark on the shaft of the pen "X iron" or "water off" or "iron off", etc. Use a Sharpie marker on the pen shaft or write on those old typewriter correction tapes and tape to the pen. I wonder WHY don't these pen mfr's put the instructions like these right onto the pen. For what they charge it seems they could easily afford to do this and keep their sizable profit margins! Hope this helps.