[REQUEST]Color Changing Tshirt

[vfs95]

I really need some help with this type of ink. I have seen multiple videos and examples, but i cant find the name of the ink and where to get it. Also the technique used to apply it to the shirt.
I would really like if anyone would help with:
1.Name
2.Where to get it
3. How its applied

Heres and example video

https://www.youtube.com/watch?v=TP-LCJPk95c