This is a cone 6 porcelain mug and glaze. We get this satin matte effect in our test kilns using the PLC6DS schedule. Larger kilns cool slower so this glaze will turn out more matte, possibly too matte. When needed we deal with that by increasing the percentage of glossy base (this is a 15:85 blend of G2926B glossy and G2934 matte with 6% black stain). The decal is from Sanbao Studio. On the left, it has just been applied. But, other than the glossy finish revealing its location, no gold design is visible. But, after the decal firing, using the MDDCL schedule, we get the result on the right.
This process of printing a design (using ceramic inks) onto film-coated paper to create a waterslide transfer. On wetting, the film decal can slide off the backing on to the glazed ware.