The Hard Coat Anodise is a process which is only applied to aluminium pans. This hardens the surface of the aluminium and makes the underlying pan more durable. A natural result of this process is the change in colour of the aluminium from silver to a deep, dark grey. The advantage of hard coat anodised pans is that due to their dark colouration they absorb the heat very well and produce a very even bake. They are excellent for proofing dough and available in base diameters of 7" to 14".