|Monthly Tech-Tip |
Both of these have likely seen a year of service. Both are highly opaque. While that enables a thinner application and more even colouration, the higher zircon content needed can produce cutlery marking, even though the glaze is glossy. Notice the green one is also crazing.
Ceramic glazes that mark from cutlery are either not properly melted (lack flux), melted too much (lacking SiO2 and Al2O3), or have a micro-abrasive surface that abrades metal from cutlery.