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I worked on the process of adding incomplete, non-hardening bar soaps and bar soaps that have deteriorated in appearance over time to the production process. Here, I followed the method of converting hydrochloric acid, which is hydrochloric acid, into fatty acids, but the product was again defective, probably because we were exposed to the caustic. This time, I applied the boiling method. In other words, I worked on two methods in one video. In this study, you will see how saponification occurs, possible sources of error, and the effect of acids on soap. Warning: the boiling method should only be applied to bar soaps that have not hardened, that is, have less caustic or more oil, and therefore do not harden.