This crocks are burn in woodfirestove about 48 hours. In the last hours they put salt in the stove and this make the glace.Please understand that the items we sell are old. And as such demonstrate characteristies of age wich may include weare scratches bubbles plattern irrugularities , mold marks etc. We try to accurattely describe any chips cracks or other damage that woud impact the value of the price. This is a a very old butter churn measures 13 with wood 28,5 inch Diameter 10 inch. The item "Antique WESTERWALD Salt-Glazed Blue & White Stoneware butter churn" is in sale since Thursday, August 16, 2018. This item is in the category "Antiques\Decorative Arts\Ceramics & Porcelain\Crocks". The seller is "kuriosesammlerin" and is located in Solms. This item can be shipped worldwide.