Abstract: A ceramic product includes a glass layer having 0.1 wt % to 9 wt % of a luster pigment for providing a metallic look. The glass layer includes 40 wt % to 60 wt % of silicon dioxide, 15 wt % to 35 wt % of boron oxide, 18 wt % or less of one or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide, and potassium oxide, 4 wt % or less of one or more alkali metal oxides selected from lithium oxide and sodium oxide, and 5 wt % or more of potassium oxide.

Abstract: An overglaze decoration material is provided that can be used to apply to a ceramic product a luster overglaze in which a luster pigment does not dissolve in glass and can thus maintain its luster properties to provide a metallic texture and high surface gloss. The overglaze decoration material in accordance with the present invention contains a frit that has a composition thereof including 40 wt % to 60 wt % of silicon dioxide, 15 wt % to 35 wt % of boron oxide, and 18 wt % or less of one or more alkali metal oxides selected from the group consisting of lithium oxide, sodium oxide and potassium oxide, and a luster pigment for providing a metallic look.

Abstract: The invention provides a process of producing a titanium oxide-forming solution, wherein a hydrogen peroxide solution is added to a titanium-containing starting aqueous solution to form a peroxotitanium complex, a basic substance is then added to the peroxotitanium complex to obtain a solution which is in turn let stand or heated, thereby forming a precipitate of a peroxotitanium hydrate polymer, at least a dissolved component derived from the titanium-containing starting aqueous solution, except water, is then removed from the precipitate, and a hydroxide peroxide solution is finally allowed to act on a dissolved component-free precipitate. The invention also provides a dispersion with titanium oxide dispersed therein.

Abstract: An overglaze color for pottery. Pigment is added to a colorless frit which has the composition (wt %):(1) silicon dioxide 30 to 70(2) alumina 0.1 to 15(3) boron oxide 20 to 40(4) alkali metal oxide 2 to 17(5) one or more oxide selected from lanthanum oxide, niobium oxide, tantalum oxide, hafnium oxide, scandium oxide, samarium oxide, europium oxide, gadolinium oxide, thulium oxide, ytterbium oxide, lutetium oxide, terbium oxide, or dysprosium oxide 0.1 to 15and having a thermal expansion coefficient of 5.0.times.10.sup.-6 /.degree. C. to 7.0.times.10.sup.-6 /.degree. C. at 50.degree. to 350.degree. C. and a thermal softeningpVperature of 500.degree. to 640.degree. C. The overglaze color according to the invention causes no cracking, increases the color developing property of the pigment and has high chemical durability.