I have been doing more and more soldering lately and want to buy a larger coil of solder. I went the the store today and the loger size has 2 rating for the electical. Well I got to thinking I had know idea which would be better 60/40 or 40/60. Any input would be great. I have been using the 40/60 tin to lead. With no adverse affects. Both inside and out.

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