Dreaded Orange Spots (DOS)
What it looks like: Small orange or yellow spots that appear on the surface or inside cured bars, often with a rancid smell.
What causes it: Free unsaponified oils are oxidizing — going rancid. DOS is more common with:
- Oils high in linoleic/linolenic acid (sunflower, hemp, grape seed)
- High superfat percentages (above 8%)
- Old or improperly stored oils
- Warm, humid storage conditions
How to fix it:
- Prevention is key. Use fresh oils and check expiration dates before making soap.
- Keep superfat at 5% or below for long shelf life.
- Add rosemary oleoresin extract (ROE) at 0.1% of total oils as a natural antioxidant — add at trace.
- Limit linoleic-heavy oils to under 15% of total recipe.
- Cure and store bars in a cool, dry, dark location.
- If bars already have DOS, they are still safe to use but may smell off. Use them quickly or rebatch if the smell is tolerable.
Soda Ash
What it looks like: A white, powdery or chalky layer on the surface of cured bars. It is purely cosmetic and does not affect performance.
What causes it: Unsaponified lye on the surface reacts with carbon dioxide in the air, forming sodium carbonate (soda ash). It is more common when:
- The soap did not go through gel phase
- Humidity is high during initial curing
- The soap batter was poured at a low temperature
How to fix it:
- Force gel phase — insulate the mold with towels and/or place it on a heating pad set to low for the first 12 hours.
- Cover the mold with plastic wrap immediately after pouring to seal out air.
- Spray with 91% isopropyl alcohol immediately after pouring and again when you uncover.
- Steam it off — hold finished bars over steam from a kettle for a few seconds. The ash dissolves and the surface becomes smooth.
- Water discount — using less water (33%+ lye concentration) reduces soda ash significantly.
Glycerin Rivers
What it looks like: Translucent, wavy lines or channels running through the bar, visible when cut. They look like rivers of clear jelly.
What causes it: Glycerin (a natural byproduct of saponification) migrates and pools into channels during gel phase, especially when:
- Titanium dioxide is used (it seems to exacerbate the effect)
- Fragrance oils that accelerate trace are used
- The soap overheats during gel phase
- High water content in the batter
How to fix it:
- Do not insulate — allow the soap to cool slowly without forcing gel
- Reduce water — use 33–35% lye concentration
- Avoid titanium dioxide — or reduce the amount used
- Refrigerate — place the mold in the fridge for the first 24 hours to prevent gel entirely
- Glycerin rivers are cosmetic only. Many soapers and customers actually find them attractive.
False Trace
What it looks like: The batter appears to have reached trace (thick, pudding-like) but has not actually saponified. When poured, it may separate into oil and lye layers in the mold.
What causes it: The oils solidified from cooling, mimicking the thickness of trace. This is common with recipes high in:
- Coconut oil
- Palm oil
- Cocoa butter
- Any solid fat that sets up below 100°F (38°C)
How to fix it:
- Ensure proper temperature — both oils and lye solution should be 100–110°F (38–43°C) when combined.
- Stick blend sufficiently — do not rely on visual thickness alone. Alternate between blending and stirring for at least 2–3 minutes. True trace leaves a visible trail and does not separate when you stop mixing.
- Drizzle test — lift the stick blender and drizzle batter across the surface. If the drizzle sits on top momentarily, you have true trace. If it immediately sinks and disappears, it is false trace.
- If you catch false trace after pouring, carefully spoon the batter back into your mixing bowl, warm gently, and re-blend to true trace.
Ricing
What it looks like: Small, hard lumps or grains appear throughout the batter, giving it a rice-like texture. The batter may also separate.
What causes it: Usually caused by fragrance oils that contain components incompatible with the soap batter. The fragrance causes localized saponification or crystallization.
How to fix it:
- Stick blend through it — mild ricing can often be blended smooth. Blend in short bursts until the lumps dissolve.
- Test fragrance oils — before committing to a full batch, test new fragrances in a small (100g oil) batch.
- Add fragrance to oils before lye — some makers mix the fragrance into the base oils before adding the lye solution, which can reduce ricing.
- Hot process it — if ricing is severe and will not blend out, cook the batch as hot process. The heat resolves the texture.
Seizing
What it looks like: The batter suddenly goes from fluid to a solid, immovable mass — like trying to stir concrete. It happens in seconds.
What causes it: Almost always caused by fragrance oils with high vanillin content, or certain essential oil blends (especially clove, cinnamon). Some fragrances are notorious "serial seizers."
How to fix it:
- Work fast — if you feel the batter thickening rapidly after adding fragrance, immediately spoon or pour into the mold. Do not try to blend further.
- Glop it in — seized soap is still real soap. Press it into the mold by hand (wear gloves!). It will be ugly but functional. You can trim and bevel the bars for a rustic look.
- Hot process save — move the seized mass to a slow cooker and cook on low. It will eventually melt down and can be re-molded.
- Prevent it — check supplier fragrance reviews for "acceleration" and "seizing" warnings. Soap at lower temperatures. Use a higher water ratio for more working time.
Cracking
What it looks like: Cracks appear on the surface or through the bar, either during the initial mold phase or during curing.
What causes it:
- Overheating: The soap got too hot during gel phase, expanded, then contracted as it cooled. A "crack canyon" down the center is a classic sign.
- Too much hard oil: Recipes very high in cocoa butter, stearic acid, or beeswax can crack as they cool because these fats contract significantly.
- Low humidity during cure: Rapid water loss from the surface while the interior is still wet.
How to fix it:
- Reduce insulation if the soap is cracking from overheating. Unwrap towels or do not cover.
- Do not oven-process in a too-hot oven.
- Reduce hard butter percentage — keep cocoa butter under 15–20%.
- Slow the cure — avoid direct fans blowing on freshly cut bars. Let them dry gradually.
- Surface cracks are cosmetic. Deep structural cracks usually indicate overheating or an extreme recipe.
Soft, Mushy Bars
What it looks like: Bars that are squishy after 48 hours, dent easily, or dissolve rapidly in use even after a full cure.
What causes it:
- Too much liquid oil (olive, sunflower) without enough hard oil/butter
- Too much water (low lye concentration)
- Insufficient cure time
- High superfat (above 8%)
How to fix it:
- Let them cure longer — some olive-heavy recipes take 8–12 weeks to fully harden.
- Use a water discount — 33%+ lye concentration produces harder bars faster.
- Increase hard oils — aim for at least 40% saturated fats. Check the hardness metric in the SoapIndex calculator.
- Add sodium lactate — 1 teaspoon per pound of oils, added to the cooled lye solution. It is a natural hardening agent that significantly improves bar firmness.
Air Pockets and Tunnels
What it looks like: Holes, bubbles, or tunnels inside the bar, visible when cut.
What causes it:
- Air trapped during stick blending
- Not tapping the mold after pouring
- Pouring too quickly or from too high
- Thick batter that traps air when spooned in
How to fix it:
- Tap the mold firmly on the counter 10–15 times after pouring to release air bubbles.
- Pour from a low height — pour the batter close to the mold surface, not from above.
- Use a spatula to smooth and press down after pouring.
- Blend carefully — keep the stick blender head fully submerged to avoid introducing air. Tilt the container if needed.
- Small air pockets are cosmetic only. Large tunnels near the surface can be trimmed.
When to Rebatch
If a batch has serious problems (lye-heavy, badly separated, severe seizing), consider rebatching:
- Grate or chop the soap into small pieces
- Add a small amount of liquid (2–3 tablespoons of water or milk per pound of soap)
- Heat gently in a slow cooker on low, stirring occasionally
- When fully melted and smooth, add fragrance/color and spoon into molds
- Let set for 24–48 hours, then unmold and cure 1–2 weeks
Rebatching salvages the chemistry but produces a rustic, textured bar.
Ready to put this knowledge into practice?