When Matrix analyses
a recipe and calculates a unity formula by default it bases unity
on the flux group of oxides. i.e. the values in the flux group of
oxides is maniplated to total one and the other values in the formula
are recalculated to preserve the correct flux to stabiliser and
flux to glass former proportions.
In the Recipe
to Formula environment the oxides included in the unity group are
indicated by an asterisk next to their chemical symbols. e.g. CaO*
for a clay recipe is for the Al2O3 oxide value to total one. The
formula is calculated to preserve the correct Al2O3 to flux group
and the Al2O3 to glass former proportions.
In the case
of a glaze the unified flux group allows the comparison of glazes
on the basis of the theoretical concept one molecule of flux to
X molecules of Al2O3 and Y molecules of SiO2.
It is sometimes
useful to change the unity group e.g. to include B2O3 where you
consider this oxide to be acting as a flux in the glaze.
the Set Unity Window
To open the
Set Unity Window (Fig.1) select the Set
Unity Group item from the Matrix menu.