The Golden Gorse Experiment: Hot vs. Cold Process Soap Through History
When you look at a block of handmade soap, you're looking at a fascinating mix of chemistry, art, and time. Take these two bars of my signature Golden Gorse soap: they were made using the exact same recipe, yet they possess completely distinct personalities. The bar on the left is a smooth, creamy cold process (CP) bar, while the one on the right is a warm, translucent amber hot process (HP) bar.
What makes these bars truly special starts long before the lye touches the oils. The base oils are triple-infused with a radiant blend of foraged gorse blossoms, dandelions, and calendula. Each of these plants is a powerhouse of natural color and traditional skin-soothing properties, resulting in a rich, sun-drenched hue before saponification even begins.
However, the thermal path you choose drastically changes how that golden color expresses itself. In the cold process bar on the left, the gentle, unforced heat preserves a softer, more muted pastel-yellow tone. In the hot process bar on the right, the external cooking energy deepens and warms the natural plant pigments, transforming them into a rich, translucent gold that looks like liquid sunshine trapped in a rustic, vintage-style block.
This blending of science and heritage feels right at home when looking backward through history. Paging through my 1883 copy of Brett's Colonist Guide, it’s clear that early New Zealand settlers and homesteaders understood that soap making wasn't just a rigid chore—it was an art of adaptation. While nineteenth-century manuals often detailed rudimentary "boiled" and "cold" methods to turn rendered fats and wood-ash lye into hard blocks for survival, today's artisan soapmakers use that same historical split in techniques to play with texture, transparency, and botanical color.
Whether you lean toward the sleek, creamy aesthetic of cold process or the homespun, accelerated warmth of hot process, both methods carry forward a rich tradition of handcrafting something beautiful and essential from the earth.
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