Final answer:
The subject highlights the historical use of sea salt for skin health benefits such as achieving glossier skin. Book 31 talks about the types of salt and their benefits for skin health.
Step-by-step explanation:
The historical use of sea salt, particularly for achieving glossier skin, can be understood from various traditional practices and ancient texts. Book 31 reviews the use of different types of salt and their health benefits. Sea salt is known for its mineral content and therapeutic properties, which explain its use in skincare for exfoliating, detoxifying, and restoring the skin’s natural moisture balance.