Aqueously light bleached samples of a mixed pulp, alum rosin sized paper, and samples which had been exposed to various control conditions, had undergone natural aging for two years while stored in the dark in unsealed polyester photo sleeves. At the end of this storage period, all paper samples were found to have darkened considerably. These discolored paper samples were further darkened markedly, and also significantly embrittled, by artificial aging. The changes in mechanical properties upon aging did not appear to be influenced specifically by the aqueous light bleaching treatment.