eBay glow in the dark powders and a little bit of deception.

One of the best things about eBay is that it allows you to buy things that you couldn't easily get before. Like photoluminescent powders for example.
There are two common technologies used for these glow in the dark powders. The older zinc sulphide (sulfide) version and the new strontium aluminate version that glows brighter for longer.
Note that these powders are not radioactive. They just charge with a light source and then gradually release light for a long time afterwards.
If you search for the new brighter version on eBay you will find many listings offering a large number of packs of different colours. What you will get is approximately one pack of the high output Strontium aluminate powder and lots of packs of the older and dimmer zinc sulphide powders.
This isn't a bad thing, as the other colours are still novel and very usable in a dark environment.
If you're just looking for high intensity and a long output time then it's better to buy a single pack of the strontium aluminate, preferably in the most efficient colour (green).

Here's a general search link for these pigments:-
https://www.ebay.com/sch/i.html?_from=R40&_nkw=strontium+aluminate&_sacat=0&_sop=15
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