Disclosed are novel imaging imaging comprising photochromic compounds of the formula: ##SPC1## Wherein X is selected from the group consisting of oxygen, sulfur and selenium; and wherein R.sub.1 and R.sub.2 are individually selected from the group consisting of a substituted or unsubstituted lower alkyl of 1-8 carbon atoms or a substituted or unsubstituted phenyl group. The photochromic compounds are responsive to light in the visible and ultraviolet region of the spectrum.
揭示了一种新的成像技术,其中包括公式为:##
SPC1## 的光致变色化合物,其中X从氧、
硫和
硒的组中选择;R.sub.1和R.sub.2分别选择自1-8个碳原子的取代或未取代的较低烷基或取代或未取代的苯基的组中。这些光致变色化合物对可见光和紫外光谱区的光线具有响应性。