The visual contrast range of architectural hardware has been designed to aid those with visual impairment.
In a lot of buildings, the architectural hardware colouring matches the door that the hardware is fitted to. For example, satin stainless steel pull handles would be used on a metal door which itself would be a stainless steel finish.
By using products from the visual contrast range, a user can identify hardware by locating it by the colour of its roses or escutcheons. This colouring allows the handle, lever, cylinder etc to stand out from the background colour of the door and therefore making it much easier to identify and use the door if you have poor sight.
Most products can be offered with a contrasted finish and this is done by selecting a RAL colour that matches the required colour.