NEW! These rubber stamps have foam backing, making them rigid enough to hold and stamp, but flexible enough to form around rounded edges. Ideal with glazes, Color Concentrates and Enamels as well as stamping in clay for unique patterns and textures. There is a white protective paper on the back of the foam that should be removed before use. Before using your stamp you should clean with white distilled vinegar. Clean with water after stamping and pat dry. A soft brush can be used to clean out any color that is in the detail of the stamp.