noun
definition
A syrupy solution of pyroxylin in alcohol and ether that evaporates on a surface to form a clear elastic film; used in surgical dressings, photographic plates and lacquer paints.
Examples of collodion in a Sentence
A common formula has i 1 parts of the acid, 3 of extract of Indian hemp, and 86 of collodion.
A characteristic difference between guncotton and collodion cotton is the insolubility of the former in ether or alcohol or a mixture of these liquids.
The so-called collodion cottons are nitrated celluloses, but of a lower degree of nitration (as a rule) than guncotton.
That such enzymes are formed in the protoplasm is evident from the behaviour of hyphae, which have been observed to pierce cell-membranes, the chitinous coats of insects, artificial collodion films and layers of wax, &c. That a fungus can secrete more than one enzyme, according to the materials its hyphae have to attack, has been shown by the extraction of diastase, inulase, trehalase, invertase, maltase, raffinase, malizitase, emulsin, trypsin and lipase from Aspergillus by Bourquelot, and similar events occur in other fungi.
The hyphae will also dissolve their way through a lamella of collodion, paraffin, parchment paper, elder-pith, or even cork or the wing of a fly, to do which it must excrete very different enzymes.
To remove these salicylic acid dissolved in flexible collodion is now generally employed.
Extract of belladonna is added to lessen the pain which might occur during the removal of the corn, and this acts as a corrective, while the flexible collodion forms a means of applying it conveniently, and constitutes the vehicle.
Exhibits created using this process collodion A generic term for any process using collodion as a binder for the light-sensitive silver salts.
Mr Annan, who had worked wet collodion, showed some brilliant pictures - groups both of men and cattle.
Scott Archer's wet collodion of 1851 process produced a negative by bringing out a latent image in a chemical developer.
To resist, therefore, the rough usage the picture will have to undergo, it should be made with tolerably strong collodion.
Dry collodion negatives, introduced later, were made by covering the collodion negatives, introduced later, were made by covering the collodion with a layer of albumen or gelatin.
His own research was aided by France Scully Osterman and Mark Osterman, respected historians and modern masters of the wet-plate collodion process.
Pour a quantity (say 1 oz.) of collodion into a bottle containing dry iodide of silver.
But the wet collodion process was then the only one available, and its inconveniences were such as to preclude its extensive employment; the real triumphs of photographic astronomy began in 1875 with Huggins's adoption and adaptation of the gelatine dry plate.