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Home › Recipes › Recipe

Updated on September 30, 2026 by Liz Marek · This post may contain affiliate links · 8 Comments

Electric Rainbow Fondant Recipe

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Recipe

Rainbow Fondant

Electric Rainbow Fondant Recipe

Looking to get a vivid rainbow of fondant colors? Look no further! This recipe will get you those electric Lisa Frank colors you're looking for!
Print Recipe Rate Recipe
Prep Time: 20 minutes minutes
Cook Time: 10 minutes minutes
Total Time: 30 minutes minutes
Course: Dessert
Cuisine: American
Servings: 10 lbs
Calories: 1763kcal
Author: Liz Marek

Ingredients

  • 6 lbs Powdered sugar sifted
  • 3 lb Mini marshmallows (Hy-Top, Walmart, Haribo brand if you can find it. Jet-Puff, Kraft or Marshmallow Fluff will not work) Make sure you get 1 lb or weight out 1 lb from 2 bags.
  • 4 ½ tablespoon Water (1 ½ tablespoon per color batch, or 1 tablespoon per batch if it's really humid)
  • 1 ½ cups Shortening or Trex
  • 3 ¾ lbs Wilton Fondant (1 ¼ lbs per color batch. If you buy the 5 lb box, use ½ of one of the packages per batch; if you buy the 1 ½ lb box, use the whole package per batch)
  • Extra Powdered sugar for kneading

Instructions

Yellow Fondant

  • Melt 1lb marshmallows in microwave, cooking for 1 minute, then mixing, then 40 seconds, then mix, then 30 seconds, until marshmallows are melted together.
  • Add 1 ½ tablespoon water to release marshmallows from bowl.
  • Place ½ cup shortening in mixing bowl.
  • Add marshmallows to mixing bowl and attach hook attachment to mixer.
  • Add in food coloring (1 teaspoon Electric Yellow food color gel).
  • Slowly add in 2lbs powdered sugar while mixing. Reserve about 1 cup of powdered sugar for later.
  • Mix on low until smooth and fondant sticks to the sides of the bowl (about 3 minutes).
  • Add in remaining 1 cup of powdered sugar and mix.
  • Wear gloves or put shortening on your hands to help get the fondant out of the mixing bowl and onto the table.
  • Add in 1 ¼ lbs of premade Wilton fondant and knead. Pull like taffy until smooth. Divide fondant in half.

Orange Fondant

  • Using ½ of the divided yellow fondant, add in approximately ½ teaspoon Orange food color gel.
  • Pull fondant like taffy until smooth. Add more powdered sugar if it's too sticky.

Pink Fondant

  • Melt 1lb marshmallows in microwave, cooking for 1 minute, then mixing, then 40 seconds, then mix, then 30 seconds, until marshmallows are melted together.
  • Add 1 ½ tablespoon water to release marshmallows from bowl.
  • Place ½ cup shortening in mixing bowl.
  • Add marshmallows to mixing bowl and attach hook attachment to mixer.
  • Add in food coloring (1 teaspoon Electric Pink food color gel).
  • Slowly add in 2lbs powdered sugar while mixing. Reserve about 1 cup of powdered sugar for later.
  • Mix on low until smooth and fondant sticks to the sides of the bowl (about 3 minutes).
  • Add in remaining 1 cup of powdered sugar and mix.
  • Wear gloves or put shortening on your hands to help get the fondant out of the mixing bowl and onto the table.
  • Add in 1 ¼ lbs of premade Wilton fondant and knead. Pull like taffy until smooth. Divide fondant in half.

Purple Fondant

  • Using ½ of the divided pink fondant, add in approximately ½ teaspoon Electric Purple food color gel (Optionally add ½ teaspoon Regal Purple for darker purple).
  • Pull fondant like taffy until smooth. Add more powdered sugar if it's too sticky.

Blue Fondant

  • Melt 1lb marshmallows in microwave, cooking for 1 minute, then mixing, then 40 seconds, then mix, then 30 seconds, until marshmallows are melted together.
  • Add 1 ½ tablespoon water to release marshmallows from bowl.
  • Place ½ cup shortening in mixing bowl.
  • Add marshmallows to mixing bowl and attach hook attachment to mixer.
  • Slowly add in 2lbs powdered sugar while mixing. Reserve about 1 cup of powdered sugar for later.
  • Mix on low until smooth and fondant sticks to the sides of the bowl (about 3 minutes).
  • Add in remaining 1 cup of powdered sugar and mix.
  • Wear gloves or put shortening on your hands to help get the fondant out of the mixing bowl and onto the table.
  • Add in 1 ¼ lbs of premade Wilton fondant and knead. Pull like taffy until smooth. Divide fondant in half.
  • Add 1 teaspoon Electric Blue and knead into fondant until color is fully incorporated.

Green Fondant.

  • Using ½ of the divided white fondant, add in approximately 1 teaspoon Electric Green food color gel (Optionally add ¼ teaspoon yellow for a more vibrant green).
  • Knead into fondant until color is fully incorporated.

Video

Notes

How to make a rainbow of fondant colors!

Nutrition

Serving: 1g | Calories: 1763kcal | Carbohydrates: 382g | Protein: 2g | Fat: 31g | Saturated Fat: 7g | Sodium: 115mg | Potassium: 12mg | Sugar: 344g | Calcium: 7mg | Iron: 0.5mg
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About Liz Marek

Liz Marek is a professional cake artist and recipe developer who has been teaching baking and cake decorating since 2008. She founded Artisan Cake Company in Portland, Oregon in 2009 and now runs Sugar Geek Show, where she publishes kitchen-tested recipes, food science explanations, and step-by-step tutorials.

Liz is best known for sculpted and hyperrealistic cakes. She won Netflix's Is It Cake? Holiday 2 in 2025 with a hyperrealistic Santa cake, and has competed on and won Food Network cake competitions. Cake Masters Magazine named her one of the top 10 cake artists in 2017. She is the author of Artisan Cake Company's Visual Guide to Cake Decorating and a graduate of the Oregon Culinary Institute.

Her focus is on explaining not just how a recipe works but why it works, so bakers can troubleshoot instead of guess. Every recipe on this site is tested before it's published.

Liz teaches full-length cake tutorials, including sculpted and hyperrealistic cakes, at Sugar Geek University.

Reader Interactions

Comments

  1. Jen says

    March 13, 2025 at 6:18 am

    Just a note - it looks like some of the ingredients were increased (marshmallows, powdered sugar, shortening), but the water and pre-made fondant are only for one batch and should be 3x that!

    Reply
    • Liz Marek says

      October 06, 2026 at 9:35 am

      You're right, thank you! The water and Wilton fondant totals were only for one color batch. I've updated the recipe card to 4 1/2 Tbsp water and 3 3/4 lbs Wilton fondant total (1 1/2 Tbsp and 1 1/4 lbs per batch).

      Reply
  2. Paula says

    November 07, 2018 at 9:15 am

    Can marshmallow fluff be used instead of marshmallows in this recipe? I don't eat lard and marshmallows have lard in them, marshmallow fluff doesn't have lard. Thank you!

    Reply
    • The Sugar Geek Show says

      November 07, 2018 at 10:16 am

      Yes it can but you'll need to follow the DKF recipe for kosher fondant http://artisancakecompany.com/2014/10/kosher-marshmallow-fondant-recipe/

      Reply
  3. Stephanie says

    August 29, 2018 at 1:29 pm

    5 stars
    Thank you! I always have such a hard time with red though - and I need to make a Lego cake for my son! =/ Any ideas?

    Reply
    • The Sugar Geek Show says

      September 01, 2018 at 9:42 pm

      Same exact process but use red food coloring 🙂

      Reply
  4. Nahid A says

    July 25, 2018 at 7:31 pm

    5 stars
    Thank you so much for wonderful tutorials I loved the details especially on how to upscale size on the wolf Cake amazing

    Reply
    • The Sugar Geek Show says

      July 27, 2018 at 8:55 am

      Yay I'm so glad!

      Reply
5 from 2 votes

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Hi, I'm Liz! I'm a cake artist and recipe developer, and I won Netflix's Is It Cake? Holiday 2 with a hyperrealistic Santa. I write foolproof recipes that explain why things work, not just how.

I also teach full-length cake tutorials, including sculpted cakes, at Sugar Geek University.

More about me →

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