Abstract
The print-out effects due to xenon light illumination were studied electronmicroscopically in the temperature range from room temperature to 250°C on comparatively perfect silver bromide crystals obtained from the low sensitive photographic plate. As a result, it was found that a few pits appeared on the edges of the grains differing from the case of the grains obtained from the SSS photographic film already reported1). Triangular patterns1,2) hardly appeared on the grains at room temperature -250°C. Various silver protrusions bounded almost with (100) crystal surfaces appeared on the grains at 90°C–160°C. Silver whisker grew the grains at 90°C–160°C exposed to xenon light in vacuum. The whisker had two twin planes and its axis was always direction, and also its crystal orientation is parallel to that of its mother crystal. It was confirmed that this whisker grew by the root growth mechanism.

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