Isinglass advantageous in situations where minimal use of water is desired for the parchment as the isinglass can be reactivated with an ethanol-water mixture. It also has a greater adhesive strength than many other adhesives used for parchment repair. Isinglass Isinglass () 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 some beer and wine. It can also be cooked into a paste for specialised gluing purposes. Its origin is from the obsolete Dutch "huizenblaas" – "huizen" is a kind of sturgeon, and "blaas" is
Pelican eel in appearance. The gulper eel is very different in appearance to most other [true] eel species. What makes the gulper eel so different from other fish, is not so much what it has, but what it doesn't have. They lack pelvic fins, swim bladders, and scales. Their muscle segments have a “V-shape”, while other fish have “W-shaped” muscle segments. Unlike many other deep sea creatures, it has very small eyes. It is believed that the eyes evolved to detect faint traces of light rather than form images. The gulper eel also has a very long, whip-like tail. Specimens that have