Bore glazing is a condition the bores develop if an engine suffers from excessive blow by during the run- in period. The condition is always recognisable by the distinct golden colour with the original hone pattern hi-lighted and unworn. This glazing or golden look is a chemical coating formed by the combustion passing by the rings, burning fragments of the cylinder bore and oil. This coating prevents complete run-in of rings and results in further fuming and glazing. Engines with glazed bores suffer from excess oil usage. Once an engine is glazed it usually requires a re-hone and the run-in procedure to re-commence.