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Article
September 1935

NITROCELLULOSE OF LOW VISCOSITY USED AS AN EMBEDDING MEDIUM FOR EYES THAT ARE TO BE SECTIONED

Author Affiliations

Philadelphia
From the Department of Ophthalmology of the University of Pennsylvania.

Arch Ophthalmol. 1935;14(3):482-483. doi:10.1001/archopht.1935.00840090168014
Abstract

Ruby in 1933 called attention to the fact that through developments in the lacquer industry there were available on the market products of nitrocellulose from which masses for embedding could be prepared that had certain advantages over the pyroxylin hitherto used for histologic purposes. According to Wilson, the viscosity of commercial brands of pyroxylin ranges from two hundred seconds to one-half second, as measured by the falling ball test. Ruby used nitrocellulose with a viscosity of one-half second manufactured by the Hercules Powder Company. Tissue that had remained in the nitrocellulose blocks for a year in his laboratory had shown no change in staining characteristics that could have been produced by the nitrocellulose.

In 1934 Davenport and Swank1 reported on the use of nitrocellulose of the same degree of low viscosity. They found that it was possible to obtain a firmer block with less shrinkage with this

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