How to Make Glow in the Dark Slime

Making Borax or Liquid Starch Slime

Pour the hot water into a medium-sized bowl. The water doesn’t need to be boiling hot, but it should be warm to the touch.

Add the clear glue. You can also use white glue, but the color of the slime won’t be as vivid. Choose non-toxic glue, particularly if children will be handling the slime.

Add the glow-in-the-dark paint and stir to combine. You can find glow-in-the-dark paint in most craft stores or in the crafting section of major stores. You can also use highlighter ink as an alternative to the paint. Just pry off the bottom of the highlighter and drop the ink filament into the bowl of hot water and borax. With a gloved hand, squeeze the filament to extract the ink. Note that if using highlighter ink, it may only glow under a blacklight.

Add the borax (available in most laundry aisles) to the separate bowl of hot water. Stir to combine. As an alternative to the borax and water, you can simply add 1/2 cup (125 ml; 4.2 fl oz) liquid starch, also available in the laundry aisle.

Mix in the borax solution. Gradually add the borax solution into the paint solution, 2 tablespoons at a time, stirring continuously, until desired consistency is achieved.

Store in a zipper bag or an airtight container. If you don’t store the slime properly, it will begin to dry out. Leaving the slime in an open container just overnight, though, can help the consistency become more rubbery if so desired.

Finished! Enjoy your glow-in-the-dark slime!

Making Cornstarch Slime

Pour the cornstarch into a medium-sized bowl. You can also use less cornstarch to produce a more watery slime. Because you’re using cornstarch rather than borax or liquid starch, this slime is a safe alternative for small children.

Add the water to the bowl of cornstarch. Stir with a spoon or with hands to combine.

Add the craft paint. Continue stirring until the desired consistency is achieved. Glow-in-the-dark craft paint is available at most craft stores as well as in the crafting section of many major stores. As an alternative to glow-in-the-dark paint, you can instead use the ink from a highlighter to color your slime. Pry off the bottom of a highlighter and drop the ink filament that’s inside the highlighter tube into the bowl of water and cornstarch. With a gloved hand, squeeze the filament to extract the ink. Note that if using highlighter ink, it may only glow under a blacklight. You can also add drops of food coloring to change the hue of the slime, just remember that the food coloring may make the slime glow a little less.

Finished! Enjoy your glow-in-the-dark slime!

Making Epsom Salt Slime

Combine the water and Epsom salt in a medium bowl. Stir until most of the Epsom salt has dissolved into the water.

Add the liquid glue and stir to combine. Clear glue will result in a brighter color of slime than will white glue. Remember to choose non-toxic glue if small children will be involved.

Add the craft paint. Stir the mixture to combine and continue stirring until the desired consistency is achieved. Highlighter ink can be an alternative to craft paint. Simply pull the bottom off a highlighter and drop the ink filament into the slime mixture. Using gloves, squeeze the ink filament to get the ink out. Be aware, though, that highlighter ink may only glow under a blacklight.

Finished! Enjoy your glow-in-the-dark slime!