But given the importance of stock and its relationship to so many other areas of the culinary arts, it's worth taking the time to understand the purpose of each ingredient, and the properties each one brings to the stock.
White stocks are used as the base for veloute sauce and various derivative sauces like the allemande and supreme sauces.Brown stocks are used for making demiglaze and its derivatives, such as bordelaise and Robert.
Note that beef or veal bones can be used for either white or brown stocks. The difference is that when making white stock, the bones are blanched first, or quickly boiled, then drained and rinsed, before simmering.
For brown stock, the bones are roasted before simmering, and some sort of tomato product is usually added. The roasting and tomato product give the brown stock its darker color.