I tried to read this interesting post very

I tried to read this interesting post very carefuly, but I didn`t understand what is problem with soldering lead free chips? I`m losing something in translation. I just bought a quantity of new chips (nFOCE3,4, IXP460, NF-G6100,G6150 etc.) for the first time. If they are lead free what would happen if I try to solder them? Is there way to solder lead free without reboling with lead balls?

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