[The application of special photographic technics in electron microscopy]

The paper reports about the application of special photographical technics in the electron microscopy. Using this methods the information contents of electromicrogramms are better to be utilized than with conventional photographical technics. Holocopy (Holokopie) allows to copy negatives of a high degree of density whereas the developing detail filter technics (Entwicklungs-detailverfahren, EDFV) as a photochemical mask method equalizes the plain contrast and improves the detail contrast and the sharpness of outlines.