Ceramic ware is glazed before entering a kiln to bake. These glazes sometimes contain lead to give products an attractive shine, according to a 1988 report in The Lancet. Acidic food or drink is especially likely to cause lead to leach out of ceramics, unfortunately for coffee drinkers with favorite earthenware mugs.Click to see full answer. Simply so, are ceramic mugs lead free?Since any ceramic, porcelain or china mugs can contain lead or cadmium from their glaze, I like the mugs that are made of glass. Glass material normally does not contain glaze unless it has painted or decal-type decorations.Beside above, how can you tell if a mug has lead in it? Anything with decal image or logo applied to the surface inside or out (those decals are almost always very high lead, especially if you can feel them with your finger tip/ if they are slightly raised above the rest of the surface of the mug.) In respect to this, is there lead in ceramic? Lead is used in the glazes or decorations covering the surface of some ceramic dishes. In some cases, however, lead in tableware can be a serious health threat. Some dishes contain enough lead to cause severe lead poisoning.Do Starbucks mugs have lead?2019 Golden Ceramic Mug: 15,700 ppm Lead. 90 ppm is unsafe for kids.