Red paint for ceramic decoration

A ceramic product comprising a red decorative portion comprising a calcined product of a red paint for ceramic decoration, the calcined product comprising:

• a glass matrix;
• and a red colorant and a protective material that are intermingled in the glass matrix, wherein the red colorant comprises gold nanoparticles and silver nanoparticles, and the protective material comprises silica nanoparticles,
• wherein
• the red decorative portion satisfies the following conditions in the L*a*b* color system, based on Japanese Industrial Standards JIS Z8729 (2004):
• the L* value is 35 to 70;
• the a* value is 20 or greater;
• and
• the b* value is 15 or greater.