When a normal photochromic benzospiran componnd ([A]) in poly-(vinyl-chloride) (PVC) matrix was exposed successively to electrons (15 kV) after UV ray (365 nm), the magenta color turned rapidly to yellow. The magenta one was a reversible product ([B]) and the yellow one was an irreversible product ([C]).[C] was a reaction product between [B] and a chlorinated component which was liberated from PVC. The conversion from [A] to [B] was faster when the distribution of [B] in a specimen was more diluted. The coloration of [B] which was connected with the coloration of [C] was thought to be able to apply for a positive type electron beam recording medium. The reverse photochromic benzospiran, usually colored in the dark, looked to be useful to reduce the preirradiation of UV ray for making [B] and the postirradiation for a read out stage. But it was influenced by a matrix and not to express its own color. So that a distinct color change did not appear by the electron bombardment. It was found that the normal photochromic spiran was colored thermally by an addition of diazonium compound. Its color did not affected by a materix and was changed apparently with the bombardment. This combined materials system looked to be used as substitute for the reverse photochromic one.