I mixed a glaze similiar to this one at Sheridan. We used 70% Redart and 30% whiting. Easy, peasy as I like it. I said to the students it would be yellow, green, red where thin. A student in the class Michelle who had temporarily zoned out said "What colour will it be?" I answered "purple!" She said "really?". The glaze became known to the class as Michelle's Purple.
I used local red clay 70% and 30% rock flour from the local gravel quarry. I've renamed it " Pond Scum" as I think that name a certain Marketing edge:).