This fragrance was inspired by the Etro perfume "Messe de Minuit," meaning "Midnight Mass," which is supposed to be reminiscent of the smell of a Catholic church. Apparently, the perfume originally had a musty smell to it, but that's gone in the present formulation, for better or for worse. It smells like frankincense and honey to me, but I might make a "musty" version someday. The ginger was added as a suggestion by Ayala Moriel, and helps with combining the hydrophilic honey and the hydrophobic frankincense oil. Think of a vinaigrette, stabilized by tiny particles of black pepper or mustard seed. It's called a Pickering emulsion, named after the English chemist Spencer Umfreville Pickering. I actually tracked down and read the 1907 paper he wrote on emulsions. Fascinating stuff. The original Pickering emulsions used quicklime, kerosene, and water. It turns out that an emulsion using copper salts (copper sulfate, CuSO4) is a great insecticide and was used on the Woburn Experimental Fruit Farm in the early 1900s. One of these days I'll write more about Pickering Emulsions. I need to come up with an official name for this formula, and costs for honey and ginger, but for now the name is just a list of the ingredients. Cost per gram is ~$0.25, or ~$15 for 68.0 g in a batch of soap.
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