Re: Ask the RPoLians; crowdsourceing answers for your game!
From the wikipedia:
British racing green, or BRG, a colour similar to Brunswick green, hunter green, forest green or moss green (RAL 6005), takes its name from the green international motor racing colour of the United Kingdom. Although there is still some debate as to an exact hue for BRG, currently the term is used to denote a spectrum of deep, rich greens. "British racing green" in motorsport terms meant only the colour green in general – its application to a specific shade has developed outside the sport.