How are decanting bulbs used when making stocks?

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In the context of molecular gastronomy, decanting bulbs are utilized as a tool for skimming stocks.1

While these instruments were traditionally found in chemistry laboratories rather than professional kitchens, they were adopted by chefs to modernize and rationalize culinary techniques. By employing such tools, practitioners of molecular cooking can improve the efficiency and precision of traditional processes, such as the clarification and refinement of stocks and broths.12