Why Did My Brown Soap Turn Tan, Red or Spotty?

Short answer: brown tends to go wrong in four ways. Too little colorant leaves it tan or beige. Iron oxide browns lean warm, so they can cure reddish, coppery or burgundy. Natural browns like cocoa powder and coffee leave specks. And vanillin browns soap slowly and unevenly, so a bar that relies on fragrance for its color can look patchy. Compare your bar to the causes below.

Start with the colorant

Check what you used and how much of it. Brown is forgiving in some ways and tricky in others.

Too little colorant turns brown tan

Brown has to cover off-white soap, and that takes a fair amount of colorant. Use too little and you get tan, beige, khaki or a milky latte. Stick to the full recommended amount.

Iron oxide browns lean warm

Most browns made for cold process are built on iron oxides, which are completely stable in soap: they won't fade, morph or bleed. Iron oxides run warm, though, so plenty of browns cure with reddish, coppery or burgundy tones. That's normal, not a mistake. For a cooler brown, choose one described as a true or neutral brown, or add a touch of black.

Pure dyes and lakes don't work in cold process

Brown dye is usually several pure dyes blended together, and pure dyes and lakes can't survive cold process pH. The blend separates and the bar ends up purple, green, orange or gray-brown. Water-soluble dyes are fine for melt and pour, where there's no lye. Lakes are oil soluble and don't work in melt and pour either.

Resin and craft micas often shift

Inexpensive brown micas made for resin, nail art or melt and pour can fade, gray out or change color in lye. If cold process isn't on the label, assume it wasn't tested.

Cocoa powder and coffee give speckled browns

Cocoa powder, coffee grounds and other pantry browns give a natural look, but you'll get specks and texture rather than even color. Use a lot of cocoa powder and the lather can turn brown. Brewed coffee as your liquid gives a soft tan, not a deep brown. Cinnamon specks and darkens too, and it can irritate some people's skin, so use it sparingly if at all.

Clays give soft, muted browns

Brown and rhassoul clays give gentle tan to mocha shades. They're stable, but they won't get you to a deep, rich brown.

Other things that change brown

Vanillin browns unevenly

Vanillin, found in vanilla, bakery, gourmand, amber and some floral fragrances, darkens soap from cream to tan to brown over days and weeks. If it's your only source of brown, expect a slow change and the chance of patches or streaks wherever the fragrance wasn't mixed in evenly. On top of a brown colorant, it can push the bar toward chocolate or nearly black-brown. Stir fragrance in thoroughly, and wait for the full cure before judging.

Yellow oils warm brown toward caramel

Extra virgin olive oil, unrefined avocado, hemp and unrefined shea give batter a golden tint that warms brown toward caramel, amber or orange-brown. Refined, pomace or light olive oil keeps browns truer.

Titanium dioxide turns brown into latte

Titanium dioxide added to the brown lightens it toward tan, latte or mushroom. Don't add it to make brown brighter: it fades color. Leave it out unless you want a light brown.

Milk, honey and sugar scorch to patchy brown

Milk, honey, sugar, beer and other sugary liquids scorch in lye and heat. In a brown bar that can look like uneven orange-brown or darker patches, often in the hot center of the loaf. Freeze milk before adding lye and keep the batch cool.

Gel and temperature change how deep brown looks

Gel gives a deeper, richer brown. Ungelled soap is lighter and flatter, and a partial gel leaves a darker center with a lighter ring.

Orange spots that appear later aren't your colorant

Small orange spots that show up weeks or months after curing, often with a stale-oil smell, are dreaded orange spots (DOS) from oils going rancid. Use fresh oils, store them cool and dark, and keep your superfat moderate.

Clumped colorant leaves specks

Brown pigments, and cocoa powder especially, clump. Added dry, they leave dark specks in a lighter bar.

What color did it turn?

• Tan, beige, khaki or latte: too little colorant, or titanium dioxide added to the brown.
• Reddish, coppery or burgundy brown: an iron oxide brown leaning warm. That's normal.
• Caramel or orange-brown from the start: a yellow base oil.
• Purple, green, orange or gray cast: a brown dye blend breaking down, or a craft mica.
• Specks and texture: cocoa powder, coffee grounds or cinnamon, or colorant that wasn't dispersed.
• Patchy or streaky brown that darkens over weeks: vanillin that wasn't mixed in evenly.
• Darker, chocolate or nearly black-brown over weeks: vanillin on top of a brown colorant.
• Uneven orange-brown patches, darker in the center: milk, honey or sugar scorching.
• Dark center, lighter edges: partial gel.
• Orange spots weeks or months later: rancid oils (DOS).
• Brown lather: too much cocoa powder or colorant.

When did you notice it?

• Right away, while pouring or in the mold: too little colorant, a brown dye blend or craft mica reacting to lye, or a yellow base warming the brown.
• When you cut it (1–2 days): gel and temperature, scorched milk or sugars, or specks.
• During cure (the first few weeks): vanillin darkening the bar, often unevenly.
• After it was fully cured: orange spots from rancid oils.

How to fix it next batch

1. Don't skimp. Brown needs more colorant than you'd think. Use the full recommended amount.
2. Pick the right brown. Choose a brown made for cold process, and a true brown if you don't want red or copper tones. Skip pure dyes and lakes.
3. Smooth it out first. Blend about 1 teaspoon of colorant into 1 tablespoon of light oil (sweet almond, sunflower or fractionated coconut). Sift cocoa powder before mixing.
4. Mix fragrance in well. If you're using a vanillin fragrance, stir it in thoroughly so it browns evenly, and judge the color after the cure.
5. Choose paler oils. Refined or pomace olive oil gives truer browns than extra virgin.
6. Leave out the white. Keep titanium dioxide out unless you want a light brown.
7. Gel it, but keep sugars cool. A full gel deepens brown, but milk and sugar soaps need to stay cool to avoid scorching.
8. Use fresh oils. Fresh, well-stored oils prevent orange spots later.

Nurture browns for cold process

These are made and tested to hold their color in cold process:

• Brewed Awakening Brown: a rich, true espresso brown with a warm copper undertone.
• Magic Mushroom Burgundy Brown: an earthy reddish-brown. The red tones step forward in cold process.
• Fire Cider Copper: a toasted amber brown with cozy red undertones, like spiced cider.
• Copper Penny: a true, rich metallic copper.

To deepen any brown, add a small amount of Black Iron Oxide or Activated Charcoal.

Ask a color expert

Not sure why your brown came out the way it did? Send us a photo and the details of your colorant, recipe and fragrance, and we'll walk you through it. Send it to Color Rescue or email your photos to support@nurturehandmade.com.