[Photomicrography of autoradiographs (author's transl)]

It is often desirable to delineate the areas of autoradiograms where accumulations of silver grains are observed in order to establish topographic landmarks. This is prevented by either bright field or dark field illuminatiated photographs, where the topography of the silver grains is neglected despite the high resolution obtainable by autoradiography, but may be done by taking advantage of a modification of dark field illumination thus generating an additional bright field effect. This modification also enables to correlate selective histochemical reaction sites with the area of silver grain accumulation.