A new composite-carrier based on magnetic particles and phenol resin has been developed for long-life electro-photographic developers. The present carrier, composed of core particles and a resin shell, is quite spherical in shape and is characterized by a narrow particle-size distribution (controllable range: 10-200 mum in diameter). The carrier core can either be made up of magnetic fine particles such as ferrites and magneties, or of non-magnetic particles such as ferrites and magneties, or of non-magnetic particles such as hematites. The content of the core particles can be as high as 90 wt
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