Brass and lead???

[lucky_jkl]

I was wondering were the article on treating brass to remove surface lead is at I haven't been able to find it online? Why is this done anyways and does it need to be done on needle valves on stills before using? Not sure why they would have lead in them friend said something about peroxide??? Also just to ask if one wanted to could one use soup cans as a column for a reflux still? Noticed cambells soup cans have a yellow tint inside is this a brass coating? Finally I saw someone online said they used brass scrubbers as packing as it left no taste unlike stainless steel scrubbers do... Do ss scrubbers leave a metallic taste to distillate and were does one get brass scrubbers anyway and should they need to be treated for surface lead???