From the Middle Ages onwards it was very widely exported and admired by other cultures, and fetched huge prices on foreign markets. Eventually Korean porcelain developed in the 14th century and Japanese porcelain in the 17th, but other cultures were unable to learn or reproduce the secret of its formula in terms of materials and firing temperature until it was worked out in Europe in the early 18th century, and suitable mineral deposits of kaolin, feldspar and quartz discovered. This soon led to a large production in factories across Europe by the end of the 18th century.