For the other dyes, I had to heat set it to make it permanent.

I was not sure if the thermochromic ink needed the same method as the other dyes.

Since the  thermochromatic ink is already heat sensitive, I could not figure it out.

I asked Suzi and she wanted me to experiment and find the answer.

So, I machine washed number 1 and 2 as shown.

Only number 2 was done with iron set.

They both did not bleed or anything but faded a little bit.

Since I don’t really see the diffrence between 1 and 2, I guess heat setting is not needed.