Flamed granite slabs are produced by treating the stone surface with a high-temperature flame generated by a mixture of liquefied gas and oxygen. Due to uneven thermal expansion caused by the heat, the surface develops a slightly textured, undulating finish-resembling a "lychee" texture-which provides a non-slip effect.
Flaming is a processing method for granite. Natural granite is first sawn into slabs, which undergo preliminary grinding. The slabs are then placed on a fixture for flame treatment. This process utilizes acetylene, oxygen, and a spray gun; the flame is moved uniformly across the slab surface at a speed of 120–250 mm per second, with the spray gun nozzle positioned 20–40 mm from the surface at an angle. The flame temperature ranges from 800°C to 1000°C. Prior to flaming, water is sprayed onto the slab; this absorbs heat through evaporation and prevents the stone from being damaged by the high-temperature flame.
