I just tried this with 70% alcohol, some of my Fyrinnae shadows, and other loose shadows, and it didn't work too well. As soon as I put it on the flat iron it began boiling....I put my iron on the lowest setting so i don't understand why. Then the boiling made all these holes in the shadow and it got pretty hard. I haven't swatched it so I'm not sure if it worked.
Some of the shadows I didnt heat up because they would boil, so I left them for like 7-8 hours while I went to work, and I came back and they are really soft (one of my Fyrinnae ones crumbled)
Maybe I'm doing something wrong??