See also:cotton and the other varieties of pyroxylin in a mixture of
See also:alcohol and
See also:ether . It was discovered in 1846 by
See also:Louis Nicolas Menard in
See also:Paris, and independently in 1848 by Dr J . Parkers
See also:Maynard in Boston . The quality of collodion differs according to the proportions of alcohol and ether and the nature of the pyroxylin it contains . Collodion in which there is a
See also:great excess of ether gives by its evaporation a very tough film; the film
See also:left by collodion containing a large quantity of alcohol is soft and easily torn; but in hot climates the presence of an excess of alcohol is an
See also:advantage, as it prevents the rapid evaporation of the ether . Under the microscope, the film produced by collodion of
See also:good quality appears translucent and colourless . To preserve collodion it should be kept cool and out of the
See also:action of the
See also:light; iodized collodion that has been discoloured by the development of
See also:free iodine may be purified by the
See also:immersion in it of a
See also:strip of
See also:foil . For the iodizing of collodion, ammonium bromide and iodide, and the iodides of calcium and cadmium are the agents employed (see PHOTOGRAPHY) . Collodion is used in surgery since, when painted on the skin, it rapidly dries and covers the skin with a thin film which contracts as it dries and therefore affords both pressure and
See also:protection . Flexible collodion, containing
See also:balsam and
See also:castor oil, does not crack, but, on the other
See also:hand, does not contract . It is therefore of less value . Collodion is applied to small aseptic wounds, to small-pox pustules, and occasionally to the end of the urethra in boys in
See also:order to prevent nocturnal incontinence .
Collodion and crystals of carbolicacid, taken in equal parts, are useful in relieving toothache due to the presence of a carious cavity . Vesicating or Blistering Collodion contains cantharidin as one of its constituents . The styptic colloid of
See also:Richardson is a strong solution of
See also:tannin in gun-cotton collodion . Similarly collodion may be impregnated with salicylic acid, carbolic acid, iodine and other substances . Small balloons are manufactured from collodion by coating the interior of
See also:glass globes with the liquid; the film when dry is removed from the glass by applying suction to the mouth of the vessel . M . E . Gripon found (Conipt. rend., 1875) that collodion membranes, like glass, reflect light and polarize it both by refraction and reflection; they also transmit a very much larger proportion of radiant
See also:heat, for the study of which they are preferable to
See also:mica .
WILLIAM WILKIE COLLINS (1824–1889)
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