There are different finishes that can be applied to the external aluminium sash which open many different possibilities:
1. A hard-wearing Polyester-powder coat in a wide range of RAL colours;
2. Metallic finish in RAL 9006 & 9007, or an anodised finish.
Internally there are further choices.
Wood can be treated with a clear lacquer to enhance the warmth of the natural grain, or painted in one of a range of RAL colours to match your interior decor.