Richard asked "What are DUNCAN glazes?"
Sorry, it's not some technical term...... just a brand name of some retail lowfire (^04) glazes. Many of those lowfire type glazes can give good/interesting results (for non-functional works) when you break the rules and use them at other temperatures. I always look for the ones without lead that say food safe. However,they should not be used for functional ware unless you follow the application and firing directions on the jar. Ah yes...Those little jars;-)
---Lisa in Florida