Why Isn't My White Soap White?

Short answer: cold process soap is naturally off-white, so a true bright white takes a pale recipe and a whitener. When a white bar comes out cream, yellow, tan or spotty, the cause is usually your base oils, vanillin in the fragrance, sugars or milk that scorched, gel heat, or a titanium dioxide problem, often mixing it into the wrong liquid. Orange spots that show up weeks later are a different issue: oils going rancid. The color it turned and when you noticed it will usually tell you which one it was.

Start with your recipe

Soap without any whitener is ivory to cream, not white. How white it gets depends mostly on your oils and what else is in the batter.

Yellow oils make cream or ivory soap

Olive oil (especially green or extra virgin), unrefined shea, unrefined cocoa butter, hemp, avocado and red palm all tint the batter yellow, gold or green-gold before you add anything else. That color carries into the bar. Coconut oil, refined olive or pomace oil, refined shea and lard or tallow give the palest base. If you want white, start with pale oils.

No whitener means off-white

Even a pale recipe cures to a soft cream. To get a bright white, you need a whitener such as titanium dioxide (CI 77891). Without one, an ivory bar is normal, not a mistake.

Milk, honey, sugar and beer turn tan or orange

Sugars scorch in lye and heat. Milk, honey, sugar, beer, juice and other sugary liquids can turn a bar tan, caramel, orange or light brown, and the hotter the batch gets, the darker it goes. Milk soaps scorch fastest when the milk isn't kept cold, so freeze milk before adding lye and keep the batch cool.

Titanium dioxide problems

Water-soluble and oil-soluble titanium dioxide mix differently

Titanium dioxide comes in two types. Water-soluble titanium dioxide, like ours, mixes into water. Oil-soluble titanium dioxide mixes into oil. Check which type you have before you use it. Mixed into the wrong liquid, titanium dioxide won't disperse: it clumps, leaves white specks and streaks, and whitens the bar unevenly. Many soapers who think their titanium dioxide failed simply mixed it into the wrong liquid.

Titanium dioxide can speck, streak or fall short

• White specks: titanium dioxide clumps easily. Undispersed clumps, often from mixing it into the wrong liquid, show up as bright white dots.
• Translucent streaks (glycerin rivers): veiny, see-through lines through the bar. They usually show up with titanium dioxide, a high water amount and a hot gel. Using a little less water and keeping the soap cooler helps.
• Still ivory: too little titanium dioxide for the recipe, or a yellow base it can't fully cover.

Other things that change white

Vanillin turns white soap tan or brown

Fragrances that contain vanillin (vanilla, many bakery, gourmand, amber and some floral scents) slowly turn soap tan to dark brown over days and weeks. On white soap there's nothing to hide it. Some fragrance and essential oils are naturally yellow or orange too, and tint the batter. For white bars, choose a fragrance with no discoloration, like the ones in our no acceleration, no discoloration fragrance oils, or use a vanilla color stabilizer.

Gel phase makes white look darker and glossier

Gelled soap is a little darker, more translucent and more ivory than soap that didn't gel. For the brightest white, keep the batch cool so it doesn't gel: soap at cooler temperatures and put the mold in the fridge or freezer if your recipe allows. A partial gel leaves a darker, glossier circle in the center with a whiter, more opaque edge.

Orange spots that appear later mean rancid oils

Small orange or yellow-orange spots that show up weeks or months after the soap cured, often with an old-oil smell, are known as dreaded orange spots (DOS). They come from oils going rancid. Old or poorly stored oils, a high superfat, lots of soft oils like sunflower or grapeseed, and humid storage all make them more likely. This isn't a colorant problem.

Aluminum tools turn soap gray

Lye reacts with aluminum. An aluminum pot, spoon or mold can leave gray streaks or a gray cast. Use stainless steel, heat-safe plastic or silicone.

A white, chalky film is soda ash

A powdery white layer on the top of the bar is soda ash, not a color change. It forms when fresh soap meets air. Spritzing the top with alcohol after pouring, or covering the mold, helps prevent it.

What color did it turn?

• Cream, ivory or light yellow from the start: yellow oils, or no whitener.
• Tan or brown that darkens over weeks: vanillin.
• Tan, caramel or orange right away: milk, honey, sugar or beer scorching.
• Darker, glossy center with a whiter edge: partial gel.
• Bright white specks or uneven white: titanium dioxide wasn't dispersed, or was mixed into the wrong liquid for its type.
• See-through veins or streaks: glycerin rivers.
• Orange spots weeks or months later: rancid oils (DOS).
• Gray streaks or cast: aluminum tools or mold.
• Chalky white film on top: soda ash.

When did you notice it?

• Right away, while pouring or in the mold: yellow oils, a tinted fragrance, scorched milk or sugars, titanium dioxide clumping, or aluminum tools.
• When you cut it (1–2 days): gel and temperature, glycerin rivers, white specks, or soda ash on top.
• During cure (the first few weeks): vanillin browning is the usual suspect.
• After it was fully cured: orange spots from rancid oils, or slow yellowing from light and age.

How to fix it next batch

1. Start pale. Use coconut, refined olive or pomace, refined shea and other pale oils, and skip extra virgin olive oil and unrefined butters in white bars.
2. Add a whitener. Use titanium dioxide or a white mica made for cold process.
3. Check your titanium dioxide type, then disperse it. Mix water-soluble titanium dioxide, like ours, into a little distilled water. Mix oil-soluble titanium dioxide into a lightweight oil (sweet almond, sunflower or fractionated coconut). Use about 1 teaspoon to 1 tablespoon of liquid and blend until smooth. White micas like Winter White mix into oil.
4. Choose the fragrance carefully. Use a fragrance with no discoloration, or add a vanilla color stabilizer.
5. Keep it cool. Soap at cooler temperatures and keep the mold cool to avoid gel, scorching and glycerin rivers. Freeze milk before adding lye.
6. Watch your water. A little less water helps prevent glycerin rivers.
7. Use fresh oils. Store oils cool and dark, use them before they get old, and keep your superfat moderate to avoid orange spots.
8. Use the right tools. Stainless steel, heat-safe plastic or silicone only. No aluminum.

Nurture whites for cold process

These are made and tested for a white that holds in cold process:

• Titanium Dioxide: our brightest, most opaque white. It's water soluble, so mix it into a little distilled water before adding it to your batter. It blanks out dull tones for a crisp white base that stays pure through the cure.
• Winter White: a smooth white mica and a speck-free alternative to titanium dioxide. Mix it into a little oil. It disperses easily and gives a bright, slightly softer white.

For white bars that stay white, pair them with a fragrance from our no acceleration, no discoloration fragrance oils.

Still not sure what happened?

Send us photos of your bar, your recipe and the fragrance you used. A Nurture color expert will look at your oils, additives, fragrance and timing, tell you what changed and what to do next time. Send it to Color Rescue or email your photos to support@nurturehandmade.com.