Isinglass 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 a bladder, or German "hausen blas", meaning essentially the same. Although originally made exclusively from sturgeon, especially beluga, in 1795 an invention by William Murdoch facilitated a cheap substitute using cod. This was extensively used in Britain in
The Substance of Fire The Substance of Fire The Substance of Fire is a play by Jon Robin Baitz. Isaac Geldhart is a childhood survivor of the Holocaust. He arrived in New York City an orphan, reinvented himself as a bon vivant, married well, and found fame and fortune as a champion of authors who are passionate about their work rather than its best-seller potential. He is faced with a family-business conflict, the potential Japanese takeover of his increasingly insolvent firm. He must browbeat his three adult children, all principal stockholders whom he dismisses in varying degrees, into accepting his plan to publish a