overburn

To burn too much or for too long.

To record more than the usual available data capacity onto (an optical disc).

To be overzealous.

An excessive burning.

The furnace with the hickory wood was at a great heat and in danger of an overburn.

But this is not possible in our ordinary commercial kiln, nor would it be practicable to try it, for the reason that the reduction taking place in the top of the kiln would be so great that the alkalis and other fluxes present in the clay would enter into combination with the ferrous oxide and result in what we term melted brick or an overburn.