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- Español: Cola de pescado
- English: Isinglass (pronounced /ˈaɪzɪŋɡlæs/, /ˈaɪzɪŋɡlɑːs/) is a substance obtained from the dried swim bladders of fish. It is a form of collagen used mainly for the clarification of wine and beer. It can also be cooked into a paste for specialized gluing purposes.
- Isinglass was originally made exclusively from sturgeon, especially Beluga sturgeon, until the 1795 invention by William Murdoch of a cheap substitute using cod. This was extensively used in Britain in place of Russian isinglass. The bladders, once removed from the fish, processed and dried, are formed into various shapes for use.