Swig drinkware with designs that glow in the dark, such as our 2022 Halloween collection featuring Hocus Pocus and Itsy Bitsy, need to be exposed to a light source first in order for the glowing effect to work.
The design will glow in the dark after being exposed to a light source for 5+ minutes, and then taken into a dark room or location immediately after exposure. It will glow brightest when exposed to direct sunlight or the direct bright light of a lamp, and will glow in the dark for up to 30 minutes at a time before needing to be exposed to light again.
You can find more about how glow in the dark materials work here: https://science.howstuffworks.com/innovation/science-questions/question388.htm
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