CageK 
Car looms are my best source. That & ovens & fridges.
Don't get the fibre insulation covered stuff mixed into it, it won't burn off.
Once you have cut most of the plastic off the looms & all of the brass connectors.
The 'burnt off weight' will be 2/3rds of that weight.
I dunno how you can burn it off, a icecream container full will cover most of a street with smoke & will cause someone to ring the fire brigade.
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