Tried out a gel pen over 10 years ago to make siggies (signature squares) to trade and was very happy. I tried everything I knew to make it run, wash out, etc. Used hit water, scrubbed, etc. it didn't bleed , hasn't caused any problems in all these years. Scrap bookers use them and they are archival. Used the silver color - I like stuff like that - so,i, guessing other colors would be just as friendly.
All is IMHO
Sandy in Mooresville, NC