Do you know what we owe to this lake beauty? It is a quarry for the extraction of kaolin, which is the basic raw material in the production of porcelain, ceramics, tiles and refractory materials. The village of Rudník is located by the stream Rudník, from which its name is derived. The origin is to be found in the word ore. Iron mining in Rudník developed as early as the 12th century. King Matej, in 1458, sent Duke Blažej to this area to disperse the Sparks. Blažej's son received the surrounding village from the king for this. At that time, there was talk of white clay in mining, today we know that it was kaolin, which was carried to pottery workshops in Jasov and Moldova. Among the benefits was the burning of coal, which was a source of livelihood until the First Czechoslovak Republic. Ladies, pay attention. Do you know why Hungarian noblewomen also came here because of kaolin? This material has long been widely used in cosmetics. Very fine kaolin in the form of white powder is a raw material used in the production of face masks. It has excellent cleansing, soothing effects, it can effectively absorb excess sebum and impurities from the skin, it helps to remove dead skin cells. The castle ladies used it as a soap, today it is a part of shower gels, dry shampoos, toothpastes, lotions and the like. That's a really strong reason to visit this place, what do you say? Bathing in water is at your own risk, as the quarry is still used to extract dry kaolin.