Isinglass
（重定向自Eisenglas）
![Adding finings to a barrel of beer](/Images/godic/202501/10/Topping_up_the_barrel_with_finings0102.jpg")
Isinglass (/ˈaɪzɪŋɡlæs/ or /ˈaɪzɪŋɡlɑːs/) is a substance obtained from the dried swim bladders of fish. It is a form of collagen used mainly for the clarification or fining of beer. It can also be cooked into a paste for specialized gluing purposes.
Its origin is from the obsolete Dutch huizenblaas - huizen is a kind of sturgeon, and blaas is a bladder.