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Many of the cells and microorganisms which are transparent to visible light, absorb or reflect the much shorter wavelengths of the ultraviolet spectrum.

Different parts of these cells sometimes absorb or reflect different wavelengths so that it is often possible to see internal portions of cells in a different color.

Where the microscope under visible light may show only vague shadows or nothing at all, ultraviolet illumination and subsequent translation into a color TV picture reveal a wealth of detail.