The form for this mug was hand thrown from white stoneware clay and has been fired 3 times in a ceramic kiln with the highest temps going over 2,100 degrees. These are custom made decals that I created using vintage images which I then had made into ceramic decals. The decal was fired on in a 3rd firing to over 1,400 degrees for permanency. Although they are permanent I wouldn't use steel wool to scrub it :-) Also, to keep the colors vibrant the mug should be hand washed.
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