I was asked by one of my children the other day if it was possible to make their glow in the dark ceiling stars glow brighter and for longer.

The answer to the question was yes, we can. In their case it was fairly easy to do but let me talk about it in general as there are a number of things to take into account.

Not all glow in the dark products are equal!

The glow in the dark pigment that is used in many older glow in the dark products is a zinc sulfide-based