Glow in the Dark Wolf Necklaces

How to glow in the dark:

The picture inside the product is made of fluorescent material. If you put it directly in the dark, it will not emit light. The correct way to use it is: put it in the dark and illuminate the product with a flashlight or light  for 10 seconds, make it absorb the light, then turn off the light, you will find it glows in the dark