I have been able to get a reduction atmosphere in my kiln without burning anything more than the organics many people use routinely in their kilns. While I never tried the reduction frits, I silver fume glass all of the time.
There are only three glasses in this piece - black, vanilla, and gray. The gradation of coloring is the result of silver fuming. There is some fading on subsequent firings, unless if you cap the fumed glass.
Barbara
Check out the glass manufacturer's recommended firing schedules... LATEST GLASS