Abstract: The present disclosure provides a technology that realizes a silver-colored decorative portion that does not spark when heated by a microwave oven, is lustrous, and has excellent coloration. A platinum solution disclosed herein is a platinum solution used for silver decoration of a ceramic substrate and includes at least Pt, Si, and Bi. In terms of a weight ratio where a total of a metal element included in the platinum solution and Si is 100 wt %, the platinum solution has a composition that includes 50 wt % to 99 wt % of Pt, 0 wt % to 25.5 wt % of a total of Au, Rh, Pd, and Ag (where a content of Rh is 0 wt % to 8.5 wt %), 11 wt % or less of Si, 10 wt % or less of Bi, 0 wt % to 5 wt % of Al, and 0 wt % to 15 wt % of other metal elements.

Abstract: The present disclosure provides a technology of obtaining a ceramic product including a decorative film which has a sufficient chemical resistance and can reduce damage during cleaning. A decorative composition disclosed herein contains at least a noble metal element and a glass matrix element. The glass matrix element contains a rare-earth element and a first element which is at least one selected from the group consisting of Si and Al. In the decorative composition disclosed herein, the content of the rare-earth element in the glass matrix element is from 1 mol % to 45 mol % inclusive, and the content of the first element in the glass matrix element is from 50 mol % to 90 mol % inclusive. This allows the decorative film having both alkali resistance and acid resistance at high level to be formed.