It is well known that no trapped electron center exists stably in irradiated silver chlorides even at low temperatures. On the other hand, the irradiation of the ultra-violet light at room temperature produces the broad absorption on the long wavelength side of the fundamental absorption, which has been assigned to so-called colloid bands by Brown and Wainfan.1Such a broad band has been observed also in AgN3,2TIN33and Pb(N3)2.3