Hi Mel,
Mad cheddar, yo, on that  'know your glaze' rap you be laying on clayart.

Just to clarify, that recipe is Tony Hansen's G1214M (from www.digitalfire.com):

>. "This is also known as the 20x5 recipe. It was developed during the early 1980s to demonstrate principles of glaze chemistry in creating a glaze base sympathetic to the development of chrome-tin pinks and maroons. ...  This recipe was developed over the years and had many versions. We now recommend G2926B as a base instead."

And just to add to your sermon, anybody who wants a bigger picture should check out Tony's wealth of free information on all aspects of claywork at www.digitalfire.com.