I mentioned before that I have several glowing projects in mind for the month of October, so today I wanted to lay the foundation and share the easiest way to make just about any project glow- glow water! Whether you're making play dough, slime, or oobleck, any sensory recipe that calls for water can be replaced with this glow water and you will end up with a glow in the dark material under the blacklight.
I started with a basic pack of highlighters and cut off the ends with a serrated kitchen knife.
I then used needle nosed pliers to pull out the felt pod inside and then placed it in a container with about 2 cups of water.
The ink soaked felt inside was surrounded in a plastic sheath, so I cut it open to help purge the ink faster.
It's best to let it sit for a few hours to get the most saturated color. You could also place the markers with the caps off, upside down in a glass of water and try to drain them that way if you worry about dulling your kitchen knives. I'm sure it would work to some degree, though I doubt you would get as bright of glow water. Perhaps only use 1 cup of water if you choose to go that route.
Other ways to make projects glow are to add fluorescent paint or the inner contents of a glow stick to your play dough, etc. We plan to try it all and compare to see which method works best, it should be a "highlight" of our month!