Two drops of gel into a bowl of white frosting and you have the shade of a deep summer sky. A teaspoon of blue spirulina powder into a second bowl and you have the soft, dusty teal of seaglass. Same starting point both times is just a tub of white frosting from the baking aisle. Two different routes to get there. One synthetic and punchy, one natural and muted. Either way, you end up with blue frosting that holds its color through a piping bag, sits clean on a cupcake, and doesn’t taste fake.

I experimented with blue spirulina as a natural blue food colorant so you don’t have to. (But I think you should.)

This is how to make blue frosting without a stand mixer, without making homemade buttercream frosting from scratch, and without guessing at the shade. Pick the method that fits the look you want, or do both side by side like we did and build a whole spectrum of blues onto one tray of cupcakes.

Trying to color white chocolate or vanilla dip/coating blue too? Here’s your how-to.

Two-tone blue frosted cupcakes on a wooden board

Table of Contents

Steps + Photos to make this recipe for Blue Frosting

Two methods. Pick one or do both. The first method gets you saturated, punchy blue fast. The second gets you a softer, more natural blue with no artificial dye. Your choice of sprinkles just for fun.

Method 1: Gel Food Coloring

Step 1: Empty a tub of white frosting into a medium bowl. We tested with Great Value Vanilla Frosting and Pillsbury Classic White Frosting, the two most common store-bought options. Both took color the same way. Stir the frosting for a few seconds with a rubber spatula to loosen it up before you add any coloring.

Plain white frosting in a glass bowl, the starting point for both methods

Step 2: Add blue gel food coloring one drop at a time. Start with two drops of royal or sky blue gel for a soft pastel, four to six drops for a true mid-tone royal blue frosting, and eight or more for a deep navy blue frosting. Gel is concentrated, so add a drop at a time. You can always add more, you can’t take it out. (Though if you hold back some white frosting, you can stir more in if you went too far in the blue direction.)

Drops of blue gel food coloring being added to a bowl of white frosting

Step 3: Fold the gel into the frosting with the spatula, pressing it through the streaks until the color is fully uniform. This takes longer than you think. Keep folding until you stop seeing dark veins running through the lighter base.

Step 4: If the frosting feels stiffer after mixing, leave it on the counter for five minutes and stir once more. Gel coloring can tighten the texture briefly, and a short rest brings it back to a smooth, spreadable consistency.

Method 2: Blue Spirulina Powder

Step 1: Empty a tub of white frosting into a separate medium bowl. Same starting point as Method 1. Great Value Vanilla pulls a little bit warmer/ivory than Pillsbury Classic White, so if you want the cleanest naturally blue frosting, Pillsbury is the better base.

Blue spirulina powder in a glass bowl, the natural blue pigment for Method 2

Step 2: Add a quarter teaspoon of food-grade blue spirulina powder to start. Blue spirulina is a natural pigment extracted from algae. It gives a softer, dustier blue than gel and doesn’t tint the flavor at this amount, which makes it the right pick for mermaid frosting, ocean vibe frosting, and any pastel baby shower frosting or gender reveal frosting where you want the color to feel calm rather than candy-bright.

Step 3: Whisk the powder in with a small whisk or a fork first, working out any clumps before you switch to a spatula. Spirulina clumps if you try to fold it in cold with a flat tool. Once the powder is dispersed, finish the mix with the spatula to get a smooth, even shade.

Soft teal blue frosting in a glass bowl after mixing in blue spirulina

Step 4: Look, taste, adjust. A quarter teaspoon gets you a pale ocean blue. Half a teaspoon hits a stronger mid-tone. Three quarters of a teaspoon takes you into a saturated teal. Past that you’ll start to pick up a faint vegetal note in the finish. Back off and accept the shade you have at that point.

Tools and Equipment

Two medium mixing bowls
Two rubber spatulas, one for each color if you’re experimenting with both
Small whisk or fork (for spirulina)
Toothpicks (optional, useful for measuring tiny amounts of gel)
Piping bags and tips or an offset spatula
Airtight container (for storing extra)

Tips for Success

Both methods in progress on a kitchen counter with bowls of tinted frosting, sprinkles, and gel coloring

Making a mess but having a blast!

Start lighter than the shade you actually want. Both gel and spirulina deepen slightly as the frosting sits. A bowl that looks almost-there at mixing time usually hits the right shade after twenty minutes on the counter.

Layer the two methods for muted shades. A pinch of blue spirulina on top of a gel-tinted frosting knocks the synthetic brightness back and gets you to a more sophisticated teal. We used this trick to get the dusty mint and muted aqua shades in the cupcake set.

The base frosting matters. Great Value Vanilla pulls slightly warmer (a hint of cream), Pillsbury Classic White is more neutral. The same amount of coloring reads a touch cooler on Pillsbury. Neither is wrong, pick the one that matches the final shade you’re after.

Watch the light. Synthetic blues fade in direct sun. If you’re decorating cupcakes for an outdoor party, frost them at the venue or keep them shaded until serving. Spirulina holds up better in light but melts faster in heat.

For piping, give it a short chill. Ten minutes in the fridge firms both tinted frostings enough to hold a clean piped swirl. Don’t refrigerate longer than that or the surface starts to crack when you pipe.

Store leftovers airtight. Both versions keep at room temperature for two days or in the fridge for a week. Bring chilled frosting back to room temperature and stir before using.

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How to Make Blue Frosting (Two Ways)

Color a tub of white frosting blue two ways: Punchy gel coloring or natural blue spirulina, both in under five minutes.

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Prep Time 2

Total Time 2

Course Dessert, How To

Cuisine American

Servings cup