crickets
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from huppakke:
Someone posted a link to Wikipedia in the comments, came across their names:
Richard Corsi, an environmental engineer and the incoming Dean of Engineering at the University of California, Davis
Jim Rosenthal, the CEO of filter manufacturer Tex-Air Filters
take what you will from this, but it's definitely not a stick-it-to-the-corp kinda thing
the color and corrosion is from the acid paste/flux used when soldering copper. whoever did the plumbing didn't wipe their joints at all after soldering. piss poor plumbing.
source: plumber.
edit- the joints look fine, although kinda hard to see. you wanna look for small damp spots/discoloration on materials under the piping and keep in mind some of it could be from condensation if that area is subject to draft. copper piping will last hella long time if installed properly and seeing how yours is supported by iron nails(suboptimal), i don't think this plumber gave a shit
it's over, kim! we have the high ground!