This is something that is going to take a few back to when there was a craze of colour changing material according to heat etc. This film fits neatly onto the back of the iPhone 4 or 4S and starts off in black (cold), the changes through red, yellow, and green to deep blue (hot), it’s just a bit of fun really, but has a nice effect all the same.

These are some of the details for the heat sensitive iPhone 4 backing;

Enjoy seeing your phone change colours with this heat sensitive backing! This self-adhesive laser cut backing will change colours in the range 90 to 95 degrees F – or just below body temperature. At only .005″ thick, it’ll fit nicely under any bumper you put on your phone too.

Priced at $11.99 (£8)

Source [Oh Gizmo]