raw materials break down into oxides when heated during the firing
the following example the whiting (CaCO3) molecule
breaks down into two oxides when heated to 825 deg. C. The carbon
dioxide (CO2) gas bubbles out of the molten
glass leaving the flux calcium oxide which lowers the melting
point of the glass formers.
remains in the glaze.
out of the
glaze as a gas.
is mixed with other oxides the melting point of the mixture may
lower than 825 deg.C.
point of a group of oxides together is called the group's eutectic.