You may or may not be surprised to know that a lot of the bigger breweries use colouring in a lot of their brews. Basically they will aim for their brew to come out a bit lighter than they are after using the colour from the malts. They will then add caramelised sugar (EBC around 35,000) to make finer adjustments so that the beer is the same colour every time. At 35,000 EBC a little goes a long way.