Hi all:
We are establishing a Swiss foundation that is devoted to future Primecoin development and promotion. We need a catchy slogan. What do you think about “Bitcoin is Gold, Primecoin is a Green gold.”
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Primecoin is Emerald. What is green gold? doesn’t make much sense IMO. Emerald is a green precious stone. Would be more appropriate…
I wouldn’t say Primecoin was ‘Green’ … Sure it has useful POW, but that doesn’t make it green… It’s still using a big old pile of energy to mine!
Don’t have any slogan ideas though 
sorry!
I think there is a wikipedia page for green gold actually. It’s called electrum also.