Spalling

* Cutting back of spalling masonry, reinforcement and repair using colour-matched stone repair mortar.

In the British-made Greek bricks the magma is not so evenly distributed, but after successive spallings the brick is converted bit by bit into the larger crystal formation […]

He says: "If we'd left any cracks exposed then it could have resulted in spalling.

A third process fluid, water, is employed to cool the burner and to aid in the removal of spallings.