Easy Glowing Slime Recipe

Make Glowing Slime With 2 Ingredients

Glowing slime is easy to make and safe for kids.
Glowing slime is easy to make and safe for kids. Anne Helmenstine

You only need 2 ingredients to make this glowing slime. The slime is non-toxic and easy to clean up. Here's what you do.

Glowing Slime Materials

  • corn starch
  • tonic water
  • black light

Use tonic water that contains quinine. It will be listed on the label. It doesn't really matter whether you use regular or diet tonic water, but diet tonic water is not sticky and is easier to clean-up.

Make Glowing Slime

  1. In a bowl, use your hands or a spoon to mix tonic water into cornstarch. There isn't any set measurement for the amount of either ingredient, but a ratio of 1 part tonic water to 1-1/2 to 2 parts cornstarch is good (e.g., 1 cup tonic water, 2 cups cornstarch). Choose the consistency you like. The slime should be difficult to stir with a spoon but can be mixed and squeezed with your hands.
  2. Turn on the black light to see the slime glow.

Glowing Slime Clean-Up

Slime clean-up is easy using warm water. You can use the black light to make sure you didn't miss any spots.

How It Works

The slime glows because the quinine in tonic water is fluorescent. This means it absorbs the invisible ultraviolet light from the black light and emits visible light. The fluorescent from quinine is bright blue.

The slime is a non-Newtonian or viscoelastic fluid. It's the glowing version of oobleck. The viscosity of the slime depends on whether a force is being applied to it. So, you can let the slime run through your fingers like a liquid, but if you punch the slime or squeeze it, it feels solid. When you apply force, you push the liquid out between the corn starch particles, so they rub together. When the slime is allowed to flow, the liquid between the corn starch granules lets them move freely.

Make Other Slime Recipes Glow

You can use tonic water in place of water in other slime recipes to make them glow. Simply substitute an equal volume of tonic water in place of regular water.

Another way to make slime glow is to break open a fluorescent highlighter pen into a cup of water. Use this dyed water in place of tonic water in this recipe or regular water in another slime recipe. The color of the glow depends on the dye used in the highlighter pen.

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