How to Make a Glow in the Dark Fluid

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With just a few ingredients, you can make a fluid that glows under a UV black light. Some methods are perfect for making glow-in-the-dark solutions for homemade glow sticks or bowls of glowing water. Others are safe enough to light up your bathwater, and with one method you can even make an edible glow-in-the-dark glaze for baked goods!

Method 1
Method 1 of 4:

Using a Highlighter for Glowing Water

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  1. For the best effect, choose a clear glass, bowl, or bottle.
    • You can vary the amount of water, but that will effect how strong your water glows. More water will dilute the glow, and less water may make it shine more intensely.
  2. Pry off the bottom of the highlighter; you may want to use a knife or a pair of needle-nose pliers to get it open. Once the highlighter is open you can remove the felt ink tube from inside.
    • The gloves will protect your hands from getting stained with ink.
    • Not all highlighters work. Even if you test them under a blacklight and the ink appears to glow when you write, they may not work once diluted in the water. Your best bet is to use a standard yellow highlighter.
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  3. It will only take a few minutes for the ink to begin mixing with the water. If allowed to soak for several hours, the water should glow very bright.
    • Use gloved hands to twist and squeeze ink out of the tube when you are finished.
    • When the ink tube is whitish, it means most or all of the ink is now in the water.
  4. The water will only glow in the presence of a UV light. Blacklights and blacklight bulbs can be found at party stores, lighting stores, or online.
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Method 2
Method 2 of 4:

Using Tonic Water and Jell-O for Glowing Baked Goods

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  1. If you want to use the glaze on a cake, you'll need to bake, assemble, and frost the cake. Same goes for cupcakes. If you want to glaze cookies, follow your recipe and allow them to cool before attempting to glaze.
    • If you are using the glaze on frosting, it is important the frosting is cold and firm to the touch. The glaze can soften or make the frosting watery if it is not hard. [1]
  2. Though you can experiment with other flavors and colors, green (lime) Jell-O is the most effective and will give off the strongest glow. [2]
    • Whisk the powder for about one minute, or until thoroughly combined with the boiling water.
  3. Tonic water contains and ingredient called quinine, which is what gives it that bitter taste. The quinine responds to UV lights and will have a blue-white appearance. [3]
    • For extra glow-power, you could incorporate tonic water into your baked goods recipe. Try stirring five tablespoons into your frosting before using it on your cake or cupcakes. [4]
  4. The mixture shouldn't be hot to the touch, or it will melt your frosting, but it shouldn't be so cold that it begins to solidify. Wait until you can safely touch the mixture before you start glazing. [5]
    • You can use an ice bath to hasten the process, just make sure you don't cool the mixture so much that it begins to set.
  5. Use a pastry brush to brush the mixture onto your cake or cupcakes. If your frosting is frozen in place, you can even hold the cupcakes upside-down and dip them into the bowl.
    • Try not to drip any of the glaze on the cake or pastry part of your baked goods, focusing only on the icing. Allow any excess glaze to drip off.
  6. To keep the frosting stiff, you need to put your cake or cupcakes back in the freezer to ensure it won't soften or melt.
    • Six coats of glaze should give you total coverage (no missed spots) and be enough to get the desired glowing effect.
    • Once all six coats have been applied, place your baked goods in the refrigerator for about 15 minutes so the glaze can set.
  7. To really emphasize the effect, you may want to use several blacklights and place your baked goods as close to the lamps as possible. The green glaze may give your baked goods a slight green tint (especially if you used white frosting).
    • Your frosting may have the slight taste of lime or tonic. Add a little flavoring to the frosting, like vanilla or almond, to cover the flavor if desired.
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Method 3
Method 3 of 4:

Using Vitamins for Glowing Water

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  1. Vitamin A, thiamine (vitamin B), niacin, and riboflavin all fluoresce strongly, giving off a bright yellow glow. [6] Most people choose a B Vitamin complex that contains a lot of thiamine and different B Vitamins. (Look for something called Vitamin B 50 complex or something similar). [7]
  2. Pound the vitamins into a fine powder by hammering them with the mallet or another heavy object, like a rolling pin or unopened bottle of wine.
    • The bag will keep the powder contained so you don't lose any. Be aware that the pounding may cause tiny tears in the bag.
  3. Stir the powder until it is mostly dissolved in the water. While this is a safe solution, you definitely don't want to drink any of this water.
  4. The fluorescent molecules in the vitamin won't glow in the dark, but they will glow in the presence of a blacklight.
    • Use extreme caution when using a blacklight around water. Keep the light a safe distance from the water so there is no possibility that it might fall in.
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Method 4
Method 4 of 4:

Using Fluorescent Paint for Multi-Colored Glowing Water

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  1. If you want water that glows in different colors (instead of the yellow that is produced by almost all other methods), buy paint in different shades. Try blue, red, and yellow, which you can mix up to create more shades.
    • Glow-in-the-dark paints will glow without the presence of a blacklight--they can be charged by exposure to regular light. The fluorescent paints will only respond to the UV rays from a blacklight.
    • Look for paints that are designed for kids and are 100% non-toxic.
  2. Using clear glasses or bottles will allow your glowing fluid to be bright and visible.
    • Using hot water will dilute the paint faster, so you will see faster results.
  3. There's not a precise measurement for the paint--just add a little and, if you need more, mix in another few drops. Stir the paint vigorously until it mixes into the water. [8]
  4. If you are using glow-in-the-dark paint, check the instructions on how to "charge" them so they glow. Usually you need to expose the paint to sunlight for several minutes before it will glow. The fluorescent paints will only glow if you have a blacklight.
    • Have fun painting with these colors, mixing water to create new shades, or doing other crafts.
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Community Q&A

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  • Question
    Which one glows the most?
    Community Answer
    The tonic one.There are other recipes you can use, like glow in the dark paint, but usually they use glow sticks. If using glow sticks, it's best done at night so it lasts through the night.
    Thanks! We're glad this was helpful.
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  • Question
    How long will highlighter ink glow with a UV light?
    Community Answer
    Probably up to two weeks depending on how much water you use and what kind of highlighter you use.
    Thanks! We're glad this was helpful.
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    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even $1 helps us in our mission. Support wikiHow
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    Not Helpful 10 Helpful 36
  • Question
    Where can I buy glow-in-the-dark paint?
    Community Answer
    You should be able to purchase it at any major retail store like Target, Walmart, etc. If not, you can purchase it online.
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    Thank you for your feedback.
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      Warnings

      • Do not drink any glow in the dark fluid.
        Thanks
        Helpful 3 Not Helpful 0
      • The ink from fluorescent yellow markers will stain everything it touches. Be careful to keep it off clothes and surfaces. It is not toxic or dangerous to humans but is not intended for human consumption.
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      Things You'll Need

      Using a Highlighter

      • Yellow, non-toxic highlighter pen
      • Water
      • Rubber gloves (optional)
      • Knife or needle-nose pliers (optional)
      • Clear container

      Using Tonic Water/Jello

      • Tonic water (regular or diet)
      • Jello
      • Pastry Brush
      • Clear container

      Using Vitamins

      • Vitamin B
      • Water
      • Clear container
      • Kitchen mallet
      • Resealable freezer bag

      Using Fluorescent Paint

      • Water
      • Glow in the Dark or fluorescent paint
      • Clear containers

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      References

      1. ↑ https://hoosierhomemade.com/glow-in-the-dark-cupcakes/
      2. ↑ https://hoosierhomemade.com/glow-in-the-dark-cupcakes/
      3. ↑ https://antoine.frostburg.edu/chem/senese/101/consumer/faq/what-are-fluorescent-compounds.shtml
      4. ↑ https://hoosierhomemade.com/glow-in-the-dark-cupcakes/
      5. ↑ https://hoosierhomemade.com/glow-in-the-dark-cupcakes/
      6. ↑ https://antoine.frostburg.edu/chem/senese/101/consumer/faq/what-are-fluorescent-compounds.shtml
      7. ↑ https://www.atlantis-press.com/proceedings/icmmse-16/25854533
      8. ↑ http://www.growingajeweledrose.com/2013/01/glowing-rainbow-water.html

      About This Article

      Article Summary X

      To make a glow in the dark fluid, try using a yellow highlighter and hot water. All you need to do is take the ink tube out of the highlighter and drop it in a clear container filled with hot water. Alternatively, use vitamin tablets. Just crush a couple of vitamin A or B tablets and pour them into a clear container filled with warm water. Another way to make fluid glow in the dark is with fluorescent paint. Just pour the paint into a container filled with hot water. You'll need a blacklight to see fluid glowing in the dark. You can buy these in party stores or online. For more tips, including how to make glow in the dark cookies, read on!

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