Photopolymers usually present lower energetic sensitivity, and to narrower wavelength range, than other more conventional recording materials for Holography such as dichromated gelatins. We have previously overcome some of these disadvantages using a mixture of visible light photoinitiators. In present communication we describe a new aqueous photopolymer containing the monomers , methylenbisacrylamide and zinc acrylate, the initiators 4,5-diiodosuccinyfluoroscein (21SF) and Methylene Blue (MB), and the coinitiator sodium p-toluensulfinate. This formulation exhibits a dramatic enhancement of the energetic sensitivity upon radiation with 5 14 or 633 nm light (Ar or He-Ne laser respectively), with regard to the same mixture but with only one dye, reaching maximum diffraction efficiencies of 15-20 % with 15-60 mJ cm2 This enhancement is explained trough a more efficient photogeneration of iniciator radicals by the ground-state formation of on ion-pair complex between cationic (MB) and anionic (21SF) chromophoros, the proximity of which must favor electron transfer between groups.This must compensate the observed absorvance decrease at 5 14 nm, with regard to the absorbance of 21SF alone in the same medium (maximum absorption at 490 nm). A clear absorbance increase at 633 nm, with regard to the absorbance of MB alone (maximum absorption at 660 nm), must also favor the phothpolymerization.