I've been wondering about this for years. Finally got an answer.

> Prompt: wiki article on Moss-covered three-handled family gredunzas

> Result:

    Moss-covered three-handled family gredunzas (Polish: Trochę węglemiarki) are a distinctive type of ceramic tableware produced in Poland between 1880 and 1910. The name comes from the gredunia, the traditional Polish earthenware pot used for the preparation of food.

    The gredunzas were produced in three sizes: the smallest, with a capacity of 120-130 cm³, was used to serve the main dish, the medium-sized one, with a capacity of 230-240 cm³, was used to serve salad, and the largest one, with a capacity of 360-370 cm³, was used to serve dessert. The gredunzas were made of red clay, with the exception of the bottom part, which was made of a lighter, cream-coloured clay. The vessels were shaped by hand, and were decorated with a distinctive, delicate pattern, usually in the form of a floral motif. The gredunzas were fired in a wood-burning kiln.

    The gredunzas were decorated with the use of a characteristic technique, in which the ceramic was covered with a thin layer of moss, then fired, and then painted over. The moss was usually collected from forests in the vicinity of Kraków, and was usually mixed with water, which made it easier to apply. The moss layer was usually covered with a dark brown or black glaze, which was then decorated with white paint. The moss was usually used to cover the whole surface of the vessel, except for the rim, where a white or yellow glaze was used. The use of moss decoration was probably an innovation introduced by the potters of Kraków. The decoration was also occasionally combined with a floral motif.