preferably however the range is 0 5 wt to 5 wt another object of the present invention is to provide chemically stable charge transport molecules which do not degrade or at least do not induce charge injection from the surface of the opc to its center when the material is exposed frequently to liquid toner another discovered component is an amine type sensitizer with these features compatible with the above described phthalocyanine absorber pigments these ir absorber pigments need to be sensitized either with an amine electron donor molecule edm or electron acceptor molecule eam compatible with the absorber pigment and the binder material which holds and supports all of the components on the surface of the opc so the whole system requires a good balance between the stable dispersion of the ir absorbers in the binder and the compatibility of the binder with the edm or eam sensitizer generally speaking most plastic materials may be effective as surface charge blocking materials due to their insulating properties however the insulating properties of the plastics usually trap the mobile charge and inhibit complete discharge of the opc device the above mentioned surface charge blocking pigments may be used together with specific sensitizers selected from the group of arylamines which also exhibit low reactivity with the surface charge species which can cause the instability of the device under the wet environment of hydrocarbon fluid the group.