If yhou let the markings stay in the fabric for more than a day it won't iron out. At least that was my expierence. I told that to a lady selling them at a quilt show I went to recently and she said that if it doesn't iron out it will wash out.
Judy

experiment on scrap fabric. saw a demo but could still see the impression after ironing

Use soap just ordered the Frixion pen from shop hop last weekend.

After reading ALL of the leads on this - I think I like the rice paper best. I have been concerned about trying any of the marking pencils and the soap method wouldn't work to trace a pattern. I want to thank everybody who has responded - a great learning experience.

It has to be 14 degrees before the marking reappears

I use the BIC mechanical pencils, they seem to come out ok so far. The main problem is the marks wear out pretty quickly, so I work in sections.

Where do you buy the Pilot Frixion Pens? Someone else posted about them not too long ago and I looked for them at Joann's but couldn't find them.

Joanns don"t carry the frixion pens and probably won't ever carry them. I don't think that is an item they would stock because of the many colors they come in.

try Staples. Just remember to test, test, test.

Thank you for the 'Tips' I will do both, I'll check Staples and I promise to test, test, test!

I use crayola washable crayons and markers. The markers slide on the fabric better than the crayons so I use them more. The lines are very visable and stay on while quilting and wash right out. Never had a problem with them. The wash right out and never leave any indication they were ever used.