This invention relates to an imaging element comprising a translucent sheet, and at least three photosensitive dye forming coupler containing layers on the face side of said sheet, wherein said at least three photosensitive forming coupler containing layers comprise a cyan dye forming layer comprising...http://www.google.com.tw/patents/US6436620?utm_source=gb-gplus-share專利 US6436620 - Color switchable photographic display image
