Isinglass From Wikipedia, the free encyclopedia For other uses, see Isinglass (disambiguation).
Swim bladder of a Rudd fish (Scardinius erythrophthalmus) Isinglass (pron.: /ˈaɪzɪŋɡlęs/ or /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 Isinglass was originally made exclusively from sturgeon, especially Beluga sturgeon, until the 1795 invention by William Murdoch of a cheap substitute using cod.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.
Isinglass (mineral): Thin transparent sheets of mica called "isinglass" were used for peepholes in boilers, lanterns, stoves, and kerosene heaters because they were less likely to shatter than glass when exposed to extreme temperature gradients. Such peepholes were also used in "isinglass curtains" in horse-drawn carriages and early 20th century cars.
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