Yellowware Pottery Nesting Mixing Bowls from Ruckel Pottery of Illinois! The term “yellowware” derives from the yellow-hued clay used to create this type of kitchenware that includes mixing bowls, butter crocks, and pudding molds. Yellowware was produced in America for about 100 years, from 1830 to 1930. This is a molded decoration in the popular “Inverted Picket” pattern from Ruckel. These are highly collectible. Very little wear and is in very good vintage condition. Some slice marks that appear to have happened in production. Please see photos and zoom in.