Dr. Bronner"s Magic Pure-Castile Bar Soap OrganicEucalyptus - 5 oz. Dr. Bronner"s Magic Pure-Castile Bar Soap Organic Eucalyptus is made by saponifying a fat or oil with an alkali. A fat or oil is a triglyceride, which means that three fatty acids of various carbon lengths are attached to a glycerine backbone. The alkali is either sodium (for bars) or potassium (for liquids) hydroxide, made by running electricity through salt water. The saponification process is a simple one-step reaction with no waste generated: the glycerine is split off from the fatty acids, and the fatty acids combine with the sodium or potassium to form soap, while the hydroxide forms water. The result is soap, glycerin and water (no alkali remains in our soaps). Dr. Bronner"s Magic Pure-Castile Bar Soap Organic Eucalyptus consists in great part of choosing the right proportions of the right oils with their different fatty acids. Most commercial soap manufacturers skimp on quality because of cost and use lots of tallow from beef fat with a little bit of coconut or palm kernel oil. Dr. Bronner"s Magic Pure-Castile Bar Soap Organic Eucalyptus is made with certified organic olive, hemp and palm oils instead of tallow, and contain three times more organic coconut oil than commercial soaps. Saponified coconut oil generates high-lather cleansing even in hard water because it has shorter-chain saturated fatty acids. Hemp, olive and palm oil-based soaps make a mild, smooth, creamy lather because these oils contain longer-chain unsaturated and poly-unsaturated fatty acids. Soaps have been made for millennia. Aside from making fire and cooking food, saponifying oil and fat into soap is one of the oldest and simplest chemical reactions known to humankind. In fact, the first soaps were accidentally made by fat dripping into the ashes of cooking fires. Other Ways Dr.