It used to be that when bouillon had boiled briskly 2–3 times, the scum was removed immediately and completely with a skimmer. This same scum is now believed to contain the valuable nutrient albumin. It is not necessary, therefore, to remove it; but if it is removed, place it in a smaller pan with 2–3 glasses of the boiled bouillon. This pan should sit on the back edge of the stove to allow the scum to settle gradually. Within three to four hours, as it is absorbed into the bouillon, it will form a thin membrane, which can be discarded. The remaining bouillon should then be strained into the original bouillon.