Abstract
THE possibilities of utilizing the differential chromatic effects of the Rheinberg ring method of illumination, which was later developed into the optical staining principles of Kraft1, in conjunction with phase-contrast microscopy, suggested that, instead of having the substage stop quite blacked out except for the annulus, cross or line, whichever the case may be, this should be replaced by an appropriate colour filter, and the portion which usually transmits the light be of another colour in contrast to it.
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References
Kraft, P., Z. deut. geol. Gesell., 84, 651 (1932).
Semmens, C. S., and Bhaduri, P. N., Stain. Tech., 14, 1 (1939).
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GRIGG, F. Colour-Contrast Phase Microscopy. Nature 165, 368–369 (1950). https://doi.org/10.1038/165368b0
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DOI: https://doi.org/10.1038/165368b0
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