Not to be nitpicky, Clara, but there is a distinct difference between glowing in the dark and being reflective, and this yarn is definitely of the reflective persuasion. I'm currently making 'candy corn' hats and mitts for my grandkids - not to wear on Hallowe'en, just during the season. If they WERE intended to be worn as part of a costume, the reflective aspect would appeal to me for safety considerations. However, as they are just for fun, I think the kids would enjoy a glow-in-the-dark component more; sadly, the one that was offered at one time by Bernat is no longer available.
"Learning how to knit was a snap.It was learning how to stop that nearly destroyed me." Erma Bombeck