Colors are probably one of the first things we learn that blend science and art — just like soap making. Mix red and blue, you get purple. Mix yellow and blue, you get green. It’s predictable… until you start working with soap.
Once you introduce lye, oils, heat, and chemical reactions, everything you think you know about color gets tossed out the window. Red and blue don’t always make purple. Sometimes they make blue and a muddy green that absolutely no color wheel ever warned you about.
I learned this again recently while trying to recreate one of our most popular bars — the Heather & Thyme tallow soap. Same ingredients, same fragrance, same mica. But I must not have been soaping at the same temperature as last time, because instead of those beautiful purple tones, I ended up with blue and a murky green. Was it ugly? Not at all. It just wasn’t the same. And that’s okay. It’s still a fantastic bar, and it will still be sold. The color just wasn’t predictable.
This happens more often with micas than with clays. Both are natural minerals, but they behave differently.
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Micas are shiny, pearlescent, and more sensitive to heat.
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Clays are matte, softer in tone, and generally more dependable.
Think of the difference between grinding a grain of salt versus grinding a coffee bean. Both are hard, both become powder, but the texture and behavior are completely different. Micas react to heat in ways clays simply don’t.
Another example: I made a new soap this week — a masculine scent I’m calling Sea Shanty. I planned for a deep bronze color. The mica had other plans. It turned into an off‑brown shade. Not ugly, just not what I intended. And again, it will still be sold. We don’t waste perfectly good soap over cosmetic surprises. That goes against our goals of being budget‑friendly and earth‑conscious.
What is under our control is process. Lower temperatures mean less heat during saponification, which helps reduce color warping with micas. It’s something we’ll revisit.
It also makes me appreciate the reliability of clay bars — like Love Thyself or UnMasqued, our face bar made with rose clay and French green clay. Rose clay is my favorite to work with. I know exactly how much to add to get the shade I want. Clays are more predictable… but still not 100% obedient.
So what does this teach us soap makers?
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Be humble. Soap will throw curveballs no matter how long you’ve been making it.
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Don’t fear mistakes. Every batch teaches you something.
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Remember that soap is art. Sometimes the soap reveals something unexpected — and it’s better than what you planned.
I set out to make a purplish‑blue heather shade. Instead, I got a greenish blue with pale green tones — the thyme quietly reminding me it was part of the blend all along. The scent is seamless; unless you’re trying to separate the notes, it doesn’t come across as overly herbal. But it’s there, and it wanted to be seen.
I won’t throw out my color wheel, but I’ll keep in mind that happy little trees don’t happen by accident. They happen because they’re meant to.