Silver - grams per Watt
*Silverbook, Fortis Bank - June 2010 lists usage at .12 grams/Watt
*International Technology Roadmap Photovoltaics - March 2001 lists usage at .3 grams/Watt
*Heraeus' London is quoting 2011 usage at just under .1 grams/Watt. They are additionally estimating usage of .05 grams/Watt in 2014
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