|Maybe try one more thing|
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Here's picture of the sort of color change you will get with old Bakelite. Sometimes the color is not so intense but it should be an amber yellow. I have never seen a color change that was brown - that I normally attribute to just removing dirt. Since I don't know what could be on the surface of degraded vulcanized rubber, I don't know if there will be a chemical reaction with a strong base like ammonia. If I find out anything I'll let you know.
BTW, the reason there is a color change for old Bakelite with Simichrome is that Simichrome has a lot of ammonia in it. The problem with using Simichrome is that it's a polish so it has abrasive particles in it which will remove the surface layer if you rub even a little. So for example If I polished the bead in this picture with Simichrome, I could remove the surface layer and then get no positive results afterwards.