This paper reports experiments that confirm Belloni (2003) that pre-soaking a silver halide holographic emulsion in a dilute solution of the formate ion (HCO2-) will hypersensitize the emulsion by a factor of 5xs to 10xs, depending on the timing of development post-exposure. The quantum efficiency of the emulsion is effectively 1 in the first case. The extremely fine grain size of the holographic emulsion (Slavich PFG-01) is maintained and holographic image quality is excellent. When combined with a TEA pre-soak the expected TEA color shift is maintained.
William R. Alschuler, "Formate as a sensitivity enhancer of holographic emulsions," Proc. SPIE 10558, Practical Holography XXXII: Displays, Materials, and Applications, 105580C (Presented at SPIE OPTO: January 30, 2018; Published: 19 February 2018); https://doi.org/10.1117/12.2286668.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon