If you put work into the kiln that has a nice reduction effect on it, and it comes out of the kiln after annealing with a greatly reduced or non-existant reduction effect, your kiln either has an oxidizing atmosphere, or your annealing temp is too high, causing the surface metals to migrate back into the glass.
To solve the problem, try dropping your high-end annealing temp a bit, still keeping it within the accepted range for the glass you're using. If that doesn't fix the problem, try a teeny bit of activated charcoal in your kiln: Put it AND the bead under a small upside down stainless bowl. The charcoal will burn, using up the O2 under the bowl and creating a reducing environment. Good ventilation is necessary, of course.
Conversely, if you put non-reduced pieces into the kiln and they are reduced when you take them out, your kiln has more of a reduction environment.
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Kiln environment. ?
