I have three of Crazy Aaron's heat sensitive putties (Amethyst Blush, Chameleon and this one). Twilight doesn't have much of a colour change compared to the others. You have to keep some cold in the container and work at the rest of it for a few minutes to notice the change and it isn't much. Like the glow putties, the heat sensitive putties are firm and I find the firmness relaxing – they're the best for squishing while talking or watching tv. Choose Twilight if you like a firm, bluey purple putty; Choose a different one for a strong colour contrast.