Someone asked me this question out of curiosity and thought why not run it by the chashuvah chevra on YW, to see what they think
The new coors light bottle turns blue and that is when you know it is cold enough to drink. Is there a problem with this on shabbos? Putting it in on shabbos, would you be causing colors to change and thus “coloring” on shabbos? Or what about taking it, when the bottle cools down, it turns back to white, so would that be “erasing” the color from the bottle?