This Polish Pottery Unikat (Signature) butter dish, is made by the Ceramika Artystyczna factory in Boleslawiec, Poland. Unikat means that it has been hand painted with both sponges and brushes and it is signed by the artist who painted it. Unikat pieces are the most involving works of art.
This butter dish is used to maintain the freshness and spreadable consistency of butter without refrigeration. This pottery crock has two parts: a base that holds water, and a cup to hold the packed in butter which also serves as a lid. The cup containing butter is placed into the base, where water creates an airtight seal that keeps the air (and thus oxygen) away from the butter so that refrigeration is not needed, and the butter can be used in its soft form. This method will keep butter for around a month provided it is kept at temperatures below 80 °F (27 °C) and the water is changed regularly.