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Original Message:   Car battery case material
My understanding is that the black material in vintage Santo Domingo Pueblo necklace components is a hard rubber that was salvaged from battery cases. I haven't heard that Bakelite was used in these necklaces but I'm not an expert on this genre.

Did your simichrome test show a warm amber color, or did you just remove some surface material - which I'd suspect would show a dark brown, indicative of degraded rubber?

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