Choosing the best colours to ensure signage stands out is not as straight forward as it seems.  When it comes to the legibility of a sign, there are many factors to consider – the environment, natural and artificial light, distance from the reader, and the contrast between the foreground and the background colours of the sign.   The Light Reflectance Value  (LRV) of colours can be measured and a formula used to determine the best colour combinations.  The use of this formula is not always necessary, but a valuable method for checking a colour combination is readable.