Im not sure how they make cloudy glass - as far as I can tell the cloudy bits have been encased.
Ive done a bit of searching ! - I understand that Harry Powell was asked by the British
Museum to make copies of Roman Glass pieces which had been unearthed in London and elsewhere.
This presumably would have meant having to reproduce any patina they might have acquired
Do you think this this might be one of his experimental patinated bits ( not one of the copies ! ) - this would perhaps
explain the high levels of bubbles/seeds, striations and impurities in the glass.
I know - its bit of a stretch
Very difficult colour to pin down, it all depends upon the light - sometimes blue sometimes green.
Scott