Glazes which have unity formulae falling within the limit formulae
parameters for the temperature at which they are to be fired, will
have no excessive overloads of any particular oxide and should fuse
to form stable glazes. They will be most likely all be'middle of the road'
glazes which have a high durability, are generally shiny
and have little if any movement.
There are an
infinite number of beautiful glazes which fall outside the standard
should not be used for the inside of domestic pottery and may not
be appropriate for the outside of pots used for functional purposes.