Patrick;
The chemicals that I mentioned were in the paper to control its curve shape, speed and dmax. They were eliminated by Kodak in the 60s and 70s to provide for a safer, less toxic environment. They did not change the quality of blacks nor did they result in any significant change in coated silver level as claimed above.
Paul;
The work on silver reduction was done in film and paper, both B&W and color. All film efforts failed, of course due to increasing grain among other things. In paper, there was no adverse affect due to a small reduction in either B&W or color, but in color we achieved an even greater effect by other means than available to B&W.
The work began when the price of silver began to skyrocket, and was cancelled by order of the CEO when the price began to drop. All of our projects were cancelled at that time.
So, as a result, none of the products with reduced silver went out the door AFAIK, but products with new chemicals in them did. And effect on dmax or blacks was tiny if there was any effect at all.
Again, see my myth of silver rich products in the emulsion making and coating forum. The dmax of any product is based on the efficiency of the silver halide in being developed, not on how much is coated.
PE