Many years ago while on a beach trip with my parents, we discovered this little shop that sold color-changing T-shirts.
It was such a unique concept at the time that of course I had to stock up on them. The clothing worked in a similar manner to mood rings, but instead of changing color depending on your mood, the T-shirts would transform from black and white to fully colored designs out in the sun and in different temperatures.
But the latest take on temperature-changing pigments is completely wild.
