Hi Bill, You may want to add a gold chloride sensitizer as well as the hypo addition. You will want to sample the emulsion at various times during the sensitization - at Fotokemika they coated glass plates, and exposed them without drying. They would expose and develop, and look for fogging or a change in the color of a step wedge image. They didn't fix the plates, just examined it in room light for a few seconds. You will probably get a bit more fogging with the gold sensitization, but at least a stop greater speed. REgards - Jim Browning