Abstract
IN NATURE of September 1 last (vol. 108, p. 10) I suggested that dry films of some of the aniline colours might prove suitable surfaces on which to rule the very fine lines required for test-plates. Since that time I have made some trials with films, using various dyes and various materials for the ruling-point. The dyes were eosin, saffranin, cyanine, methyl-green, methyl-blue, and methyl-violet. The last of these gave the most uniform films, leaving, on the evaporation of the solvent, a bright surface free from structure. Cyanine gave good films, though not quite so opaque as the methyl-violet for the same thickness. The others, either from a tendency to crystallise or from drying with a dull surface, were not so satisfactory.
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MALLOCK, A. Test-plates for Microscopes and Microscopic Definition. Nature 109, 205–206 (1922). https://doi.org/10.1038/109205a0
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DOI: https://doi.org/10.1038/109205a0
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