That's a good question. Where is the thread from? Robison Thread says they can go through many washings. So all may be made the same.

I have made things with glow in the dark thread and it washed nicely.

I have used the Sulky Glowy. LOVE it! and myy sons t-shirt was not only washed but DRIED! eeks! told DH to hang...it still glows great! he actually leaves it out of his closet ;)

Warning though, i just did another glowy project, and i was supposed to iron finished project. well i just was following directions and didn't think about it until after i had set the iron down...where the iron hit still glows but definitely not as bright as the rest of the project.

hope that helps

good question - I see that a couple say you can - *4U

I am glad that you asked this question. Wouldn't it be fun to use this thread with 3D flowers.