If the chrystals in mood rings get exposed to air, do they turn black?

Question

If the chrystals in mood rings get exposed to air, do they turn black?

Answer 1

If the surrounding temperature of the air is cool or cold enough, then yes- The "Liquid Crystals" in "Mood Rings" & all types of "Mood Jewelry" will turn to a "Dark Gray", "Gray/ Black" or "Black" color.

Answer 2

yes as above said. Mood rings turn dark when cold and colors when warm.