Natural Blue Food Coloring and Dye Recipe
Make your own natural blue food coloring with butterfly pea flowers, water, and food grade ethanol. This recipe is designed for bakers, frosting makers, candy makers, and DIY food crafters who want a concentrated blue color made from a recognizable botanical ingredient.
Butterfly pea flowers are known for their blue color and their pH-sensitive behavior. In neutral recipes, the finished coloring can appear blue to blue-purple. In acidic recipes, it may shift toward purple or pink. This guide explains how to make the coloring, how to use it, and why USDA Certified Organic 200 Proof Food Grade Ethanol is used as the starting alcohol for a 50/50 alcohol-water extraction.
Jump to Section
- At a Glance
- Why Make Natural Blue Food Coloring?
- Why Use Food Grade Ethanol?
- Why Butterfly Pea Flowers Make Blue Color
- Butterfly Pea Flower Blue Food Coloring Recipe
- How to Use Natural Blue Food Coloring
- Best Uses and Limitations
- Why Blue Can Turn Purple, Pink, or Green
- Other Natural Blue Coloring Ingredients
- Storage and Shelf Life
- Safety Notes
- Common Questions
- Shop Food Grade Ethanol for Natural Food Coloring
At a Glance
| Item | Recommendation |
|---|---|
| Color | Blue to blue-purple |
| Main ingredient | Dried butterfly pea flowers |
| Starting alcohol | USDA Certified Organic 200 Proof Food Grade Ethanol |
| Final extraction strength | Roughly 100 proof when mixed 1:1 with water |
| Prep time | 5 to 10 minutes |
| Steep time | 12 to 24 hours |
| Best uses | Frosting, glazes, sanding sugar, drinks, decorative accents, and light-colored desserts |
| Watch for | pH shift, heat fading, oxidation, and gradual color loss over time |
| Storage | Amber glass bottle or jar, stored cold and dark |
Why Make Natural Blue Food Coloring?
Natural blue food coloring can be useful when you want color from a botanical ingredient instead of a conventional artificial dye. Blue is one of the harder natural colors to create because many blue plant colors are sensitive to pH, heat, oxygen, and storage conditions.
Butterfly pea flowers are a strong choice because they create a blue liquid quickly and can be used in small amounts. The tradeoff is that the color is reactive. Lemon juice, vinegar, cream cheese frosting, fruit fillings, and other acidic ingredients may shift the blue toward purple or pink. For best results, test a small amount in the exact recipe before coloring a full batch.
Why Use Food Grade Ethanol?
For this recipe, food grade ethanol is used with water, not by itself. The water helps pull color from the dried butterfly pea flowers, while the ethanol helps create a concentrated liquid color that can be easier to use in frosting, glazes, sugars, and decorative kitchen projects than a plain watery infusion.
Starting with 200 proof ethanol gives you control over the final alcohol-water balance. Instead of using vodka, rum, or another beverage alcohol with its own flavor, sugar, or additives, you can mix equal parts USDA Certified Organic 200 Proof Food Grade Ethanol and water to make a simple 50/50 extraction solution.
Only use food grade ethanol for culinary projects. Do not use rubbing alcohol, denatured alcohol, fuel alcohol, or industrial solvent products in food. If you are comparing alcohol types, read more about denatured alcohol vs. non-denatured food grade ethanol.
Why Butterfly Pea Flowers Make Blue Color
Butterfly pea flowers, also known by the botanical name Clitoria ternatea, are commonly used in Southeast Asian food and drink traditions for their striking blue color. The color comes from pH-sensitive pigments associated with the flower petals. In a neutral solution, the color often appears blue. When acidity is added, the color can move toward purple or pink.
This color-changing behavior is part of what makes butterfly pea flowers popular, but it also means the finished coloring is not as predictable as standardized artificial blue dye. A batch of buttercream, royal icing, glaze, drink, or candy may look different depending on the recipe’s acidity, temperature, and storage conditions.
Butterfly Pea Flower Blue Food Coloring Recipe
Ingredients
- 1 cup dried butterfly pea flowers, loosely packed
- 1/2 cup, 4 fl oz, about 118 ml USDA Certified Organic 200 Proof Food Grade Ethanol
- 1/2 cup, 4 fl oz, about 118 ml distilled water or neutral-tasting filtered water
Equipment
- 1 clean pint or quart glass jar with an ethanol-compatible lid
- 1 clean amber glass bottle or jar for finished storage
- Fine mesh strainer
- Coffee filter or cheesecloth, optional for clearer finished coloring
- Label and marker
Steps
- Prepare the flowers. Break apart any densely packed butterfly pea flowers, leaving the flowers mostly whole. Remove any green bases or visible stems if present.
- Mix the extraction liquid. Combine the 200 proof food grade ethanol and water in a clean glass jar. This creates a simple 50/50 alcohol-water solution that is roughly 100 proof for this kitchen recipe.
- Add the flowers. Add the dried butterfly pea flowers to the jar and press them gently below the liquid so they are fully moistened.
- Cover the jar safely. Cover tightly with a clean lid suitable for alcohol-water extraction. If using a metal lid, place a small piece of parchment paper between the jar and lid to reduce direct contact.
- Shake and steep. Shake the jar to integrate the flowers and liquid. Let the jar sit at room temperature, away from direct sunlight, for 12 to 24 hours. Shake once or twice during steeping if convenient.
- Strain the coloring. Pour the liquid through a fine mesh strainer into a clean glass jar. For a clearer finished coloring, strain again through a coffee filter or cheesecloth.
- Bottle and label. Transfer the finished blue coloring to an amber glass bottle or jar. Label it with the ingredient and date.
- Store cold and dark. Keep the finished coloring tightly sealed in the refrigerator or freezer door, away from light, heat, and open flames.
Important recipe note: Do not use 200 proof ethanol by itself for this recipe. Butterfly pea flower color extraction benefits from water in the solvent, so the 200 proof ethanol is used as the starting alcohol and then mixed 1:1 with water.
Color note: Natural blue color is delicate. Use the finished coloring soon after making it for the strongest color transfer, and test a small amount in your recipe before coloring a full batch.
Need food grade ethanol for this recipe? Start with Culinary Solvent USDA Certified Organic 200 Proof Food Grade Ethanol, then mix it 1:1 with water to create the alcohol-water solution used for butterfly pea flower extraction. This gives you a clean, neutral starting alcohol without added flavor, sugar, denaturants, or artificial color.
How to Use Natural Blue Food Coloring
Use homemade butterfly pea flower food coloring drop by drop. Stir thoroughly after each addition, then wait a minute before adding more. Natural colors often build more gradually than artificial dyes, and blue can shift quickly when the recipe contains acidic ingredients.
- Buttercream frosting: Add a few drops at a time and mix well. Avoid acidic flavorings if you want the color to stay blue.
- Royal icing: Works best in small batches where you can test the final shade before decorating.
- Glazes: Use sparingly so the liquid does not thin the glaze too much.
- Sanding sugar: Add a few drops to sugar, stir until evenly colored, then spread on parchment and allow the ethanol to evaporate before storage.
- Drinks: Works well for color-shift effects, but acidic drinks may turn the color purple or pink.
- Baked goods: Test first. Heat, batter color, and recipe acidity can change the final shade.
For more kitchen-focused uses of ethanol, see Culinary Solvent’s guide to food grade ethanol for chefs and bakers.
Best Uses and Limitations
| Use Case | Works Well? | Notes |
|---|---|---|
| Buttercream frosting | Yes | Use drop by drop. Acidic flavors may shift blue toward purple or pink. |
| Royal icing | Yes | Good for small test batches and decorative work. |
| Sanding sugar | Yes | Let the ethanol evaporate before sealing the sugar for storage. |
| Glazes | Yes | Use sparingly so the glaze does not become too thin. |
| Beverages | Maybe | Excellent for color-shift effects, but acidity can change the shade quickly. |
| Cake batter | Maybe | Heat and batter color can mute or shift the finished blue. |
| Long-baked applications | Limited | Natural blue color may fade or change during extended heat exposure. |
Why Blue Can Turn Purple, Pink, or Green
Butterfly pea flower color is pH-sensitive. That means the finished shade depends on the acidity or alkalinity of the food or drink it is added to. Neutral recipes are more likely to stay blue. Acidic ingredients such as lemon juice, vinegar, cream cheese, buttermilk, yogurt, fruit fillings, or citrus flavorings can shift the color toward purple or pink.
More alkaline conditions can shift the color toward greenish blue or green. This is why butterfly pea flower is often used in color-changing drinks and desserts. For everyday baking and decorating, treat this as a recipe variable. Test a small spoonful of frosting, glaze, drink, or batter before adding the coloring to the full batch.
If you want a purple result instead of blue, see the guide to natural purple food coloring.
Other Natural Blue Coloring Ingredients
Butterfly pea flowers are the lead ingredient for this homemade blue food coloring recipe, but they are not the only natural blue option. Some ingredients work better as an alcohol-water extraction, while others work better as a water-based preparation, powder, paste, or commercial color additive.
| Ingredient | Color Range | Best Method | Flavor Impact | Best Uses |
|---|---|---|---|---|
| Butterfly pea flowers | Blue to blue-purple | Alcohol-water extraction or water infusion | Mild earthy or floral note | Frosting, drinks, sanding sugar, glazes, decorative accents |
| Red cabbage | Blue with pH adjustment | Water extraction plus careful pH adjustment | Cabbage flavor if overused | Educational color projects, some icings, decorative use |
| Spirulina extract or powder | Blue-green to teal | Usually used as powder or commercial extract | Marine, green, or earthy note possible | Frostings, smoothies, frozen desserts, candies |
| Galdieria extract blue | Bright blue | Commercial color additive, not typical home extraction | Usually neutral in commercial use | Packaged foods and commercial formulations |
Red Cabbage
Red cabbage can create blue color when its pigments are extracted and carefully adjusted with a small amount of alkaline ingredient, such as baking soda. It should not be treated as a simple one-for-one swap for the butterfly pea flower recipe. Too much baking soda can change flavor, and too much cabbage extract can bring a vegetable note.
Spirulina
Spirulina can create blue-green to teal color, especially in frostings, frozen desserts, smoothies, and candies. It is usually used as a powder or commercial spirulina extract rather than as a homemade ethanol extract. Use sparingly and test first, because spirulina can bring an earthy or marine note when used heavily.
Storage and Shelf Life
Store finished butterfly pea flower food coloring in a clean amber glass bottle or jar with a tight-fitting lid. Keep it cold and dark, such as in the refrigerator or freezer door. Avoid sunlight, heat, oxygen exposure, and loose lids.
Natural blue color is usually best soon after making. Over time, oxidation, light exposure, and recipe conditions can dull or shift the color. Make small batches when possible and discard the batch if you notice mold, off odors, unusual cloudiness, or any sign of contamination.
For more handling guidance, review Culinary Solvent’s page on safe use, handling, and storage of food grade ethanol.
Safety Notes
High-proof food grade ethanol is flammable. Keep it away from heat, flames, stovetops, smoking materials, sparks, and high heat. Use in a ventilated area and keep the bottle closed when not measuring.
Use glass containers and ethanol-compatible lids. Do not cover jars with plastic wrap. If using a metal lid, place parchment paper between the jar and lid to reduce direct contact.
Some alcohol may remain unless the finished coloring is baked, dried, or otherwise allowed to evaporate. Use judgment when serving children, pregnant people, people avoiding alcohol, or anyone with dietary restrictions.
Do not use rubbing alcohol, denatured alcohol, fuel alcohol, or industrial alcohol in food. Food coloring recipes should only be made with alcohol that is appropriate for culinary use.
Common Questions
Can I use butterfly pea flower coloring in frosting?
Yes. Start with a few drops and mix thoroughly. Buttercream and royal icing can work well, but acidic ingredients may shift the blue toward purple or pink.
Why did my blue food coloring turn purple?
Butterfly pea flower color changes with pH. Acidic ingredients such as lemon juice, vinegar, cream cheese, yogurt, buttermilk, or fruit flavorings can push the color toward purple or pink.
Can I use 200 proof ethanol by itself?
No. For this recipe, 200 proof ethanol should be mixed with water first. Butterfly pea flower extraction benefits from a water-alcohol solution, so the recipe uses equal parts ethanol and water.
Does the alcohol remain in the finished food?
Some alcohol may remain unless the coloring is baked, dried, or otherwise allowed to evaporate. Use judgment when serving people who avoid alcohol.
How long does homemade blue food coloring last?
The best color is usually early. Store the finished coloring cold, dark, and tightly sealed. Discard it if you notice off odors, mold, unusual cloudiness, or major color degradation.
Can I make blue food coloring from red cabbage instead?
Yes, but it is a different process. Red cabbage usually requires water extraction and pH adjustment with a small amount of baking soda. It should not be treated as a direct substitute for the butterfly pea flower alcohol-water method.
Is homemade blue food coloring the same as artificial blue dye?
No. Artificial blue food coloring is typically standardized for strength, shade, and consistency. Homemade butterfly pea flower coloring is more ingredient-driven and pH-sensitive. It can be beautiful, but it should be tested in your recipe before a major baking or decorating project.
Shop Food Grade Ethanol for Natural Food Coloring
Ready to make your own natural blue food coloring? Start with pure, non-denatured food grade ethanol from Culinary Solvent, then follow the recipe above to create a concentrated butterfly pea flower color for frosting, glazes, sanding sugar, drinks, and other kitchen projects.
Shop USDA Certified Organic 200 Proof Food Grade Ethanol for natural food coloring, culinary extracts, baking projects, and other kitchen uses.