We are experiencing dull / grainy TH solder joints, made by hand soldering
w/ iron @ 500F.  At first, it appeared to be residue on the surface, so I
started chasing the cleaner.  But all checked out OK.  I refluxed (water
soluble, ORH0) and reflowed (iron @ 600F).  This improved the finished
appearance, but not 100%.  While eutectic, the joint is perfect.  Then when
I draw the iron away, it cools and the surface finish is no longer smooth or
shiny.  What can cause this?


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