From: curd@notformail.com   
      
   On Fri, 17 May 2019 16:15:13 -0400, Phil Hobbs wrote:   
      
   > Solder oxidizes as it ages, RMA flux is too weak to deal with it, and   
   > 63Sn/37Pb is somewhat better than 60/40 and much much better than 50/50,   
   > which is suitable only for plumbing.   
      
   YMMV. I've had no problems at all using fluxed solder I bought from a   
   German fleamarket 25+ years ago and it's still a delight to use, flows   
   beautifully, NEVER gives dry joints and shines like a mirror when set.   
   Perhaps you just had a bad batch. Not all manufacturers are the same.   
      
      
      
      
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