which contain a third category of oxides, commonly called glass stiffeners
or stabalisers, are added to the glaze recipe the melting
range of the mixture is extended such that it gradually softens passing
through a treacle-like or highly viscous stage before eventually
becoming water-like and too fluid to hold its position.
the term used to describe the fluidity of the molten glaze. The
more viscous the melt the more treacle-like it is with a tendency
to move very slowly on sloping or virtical clay surfaces.