Beeswax on oxidized silver?

This started out as Beeswax on Bronze. But my question is about this:
Often the nice deep flat black I intend to get from using a product
like liver of sulfer or the bottled equally smelly liquid oxidizing
products end up with a bit of a greyed or almost a bit of a white
crusty look instead. What to do now? I’ve thought that applying a
sealer or something might turn it blacker. Any thoughts on this
problem? Net