I first encountered spirulina during a health food phase that, like most phases, eventually passed. But a jar of the vivid green powder remained in my cabinet, forgotten until the day I wondered what would happen if I added it to clear soap base. The result was nothing short of magical—a deep, oceanic green that looked like captured seawater.

What I love about spirulina in soapmaking is how it connects the bar to something primal and elemental. This blue-green algae has existed for billions of years, photosynthesizing in ancient oceans long before the first fish evolved. There's poetry in using such an ancient ingredient to cleanse our modern bodies.

The first batch I made was entirely green throughout, beautiful but somewhat one-dimensional. I started experimenting with layers, creating gradient effects that mimicked the way sunlight penetrates ocean water—darker at the bottom, lighter at the top. Each bar became a tiny window into a underwater world.

Adding sea salt to the formula came from wanting more texture and mineral content. The salt crystals suspended in the clear base catch light in interesting ways, creating an effect like sunlight dancing on waves. The sensory experience of using this soap—the slight grittiness of the salt, the clean scent of eucalyptus, the visual reminder of the sea—turns a daily routine into a brief vacation.

Spirulina can be temperamental. Too much makes the soap look almost black rather than green. Too little barely shows. The sweet spot I found is about half a teaspoon per pound of base, adjusted slightly based on the specific spirulina brand. Each batch taught me something new about balancing color and clarity.

I've given this soap to friends who live far from any ocean, and they tell me using it in their morning shower helps them feel connected to something larger than their landlocked lives.

Step-by-Step Instructions