Dating as far back as the 13th Century, the minerals found in the salt-pans, located in what is now Portoroz city, have been reported to offer extraordinary cosmetic value. The secret appears to be a particularly high concentration of minerals and rich black mud that is found in Secovlje salt-pans which still working in a natural way.

This unique mineral-enriched mud not only is known for enhancing beauty, it is also the drawing card that brings thousands of people to this region every year who are suffering from psoriasis, eczema, acne and a variety of other skin ailments. Minerals play a very important role in hydration. They work to increase the rate of the metabolic process. They ensure the normal functioning of skin so that it maintains its healthy and radiant look. They also maintain the natural pH of the epidermis.

Mud has a purifying effect. It is used to absorb skin secretions such as oils and perspiration, it purifies and deep cleanses skin's pores.