A triaxial blend
would reveal the result of both increasing the feldspar and
lowering the sources of amphoteric and acid oxides in the
original glaze (clay & silica).
In this example
blend the glazes between A and B
represent an increase in feldspar only.
The glazes along
the line from A to C
have decreasing amounts of both clay and silica materials.
and C the glazes move from maximum
feldspar to minimum clay and silica.