Cold-process soap-making is a sustainable method that retains the therapeutic properties of botanical ingredients. This study aimed to formulate and evaluate a cold-processed soap using coconut, olive, and castor oils with lavender essential oil as a natural additive. The SOAPCALC formulation tool was employed to calculate the required lye and water quantities based on the saponification values of the selected oils. The soap was prepared at controlled temperatures (35–40°C), ensuring the retention of volatile and bioactive compounds. Physicochemical parameters were tested as per IS 286:1981 standards by a NABL-accredited laboratory. Results indicated a high Total Fatty Matter (TFM) content of 73.8%, moisture content of 3.98%, acceptable pH, low free alkali (0.13%), and the presence of glycerol and unsaponified oils, which contribute to the soap’s moisturizing properties. The study confirms that cold-processed lavender soap made using plant-based oils is dermatologically safe and aligns with natural cosmetic product development goals.
Buragana et al. (Thu,) studied this question.
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