The earliest attempts at replacement in our day resulted in the ‘Golden Powder’ of the 1970's. It was made with ascorbic acid, which is Vitamin C, as the fuel. It was intensely hygroscopic, both before and after firing, sucking up water like a sponge. Exposure to moist air changed its shooting qualities enormously and shelf life was abysmal. It went exactly nowhere.
Development has continued in the last decade with Ascorbic Acid based powders although under different auspices and with better success. One product was Black Canyon powder, which was available for a couple of years. This powder was large grained, blackish, produced somewhat lower velocities compared to Black Powder but with less smoke when shot across my son David’s chronograph
Both Black Canyon and CleanShot use Ascorbic Acid for fuel, although granulation is quite different. Only CleanShot is currently available.[/color]
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