When you burn it it's too when you skin it it's 1 LOLyou really can burn number one copper if you got some I'll take it and I promise you that if it's number one I will pay you for number one not number two or number three or bare bright
#1 is completely clean and hasn't been burnt off just nice clean copper, #2 copper is clean but has been burnt off or has small peices of copper pipe or tubeing
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