I need help from glass and/or science understanders, please. I found a fragment of glass bottle base. The glass appears opaque dark blue (not iridescent) but when held to the light it appears transparent mid green. It also appears to be exuding an orange powdery substance, which I assume is an oxide. I'm therefore wondering if this is dichroic glass, although it doesn't look like any contemporary dichro I've seen. I think it's the wrong colours to be a Tyndall effect, but might Rayleigh scattering or something similar produce this effect? I have no idea what I'm talking about here, obviously.
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