calblacksmith Moderator Joined: 25 Nov 2007 Posts: 6,827 Location: Riverside, Ca, U.S.A. Expertise: I live coffee
Espresso: ECM Veneziano A1 Grinder: Many different commercial Vac Pot: 40s era Silex Drip: Milita, Bunn&Curtis... Roaster: Cast iron pan, gas burner
Posted Tue Jan 1, 2013, 8:13pm Subject: Re: Portafilter lost its shine in the dishwasher
what happened is very simple you have an aluminum porta filter and it was polished. the harsh chemicals in the dishwasher disolved all the gloss on the Polish and expose the raw aluminum which is oxidized. once you remove the oxidized metal (which will drop off your fingers) then it will be safe to use.
EDIT: Just adding that we have a Kitchen Aid stand mixer that has an aluminum beater, it wound up in the dishwasher by accident and the exact same thing happened, it went from a nice shiny polished beater to a dull grey one that had aluminum oxide rubbing off onto your fingers. A scrub with Scotchbright took off the oxidation but left a dull but clean surface that is perfectly useable. YMMV!
In real life, my name is Wayne P.
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fwtechwiz Senior Member Joined: 19 Feb 2010 Posts: 528 Location: Fort Wayne, IN Expertise: I live coffee
Espresso: Gaggia Evolution Grinder: Hario Skerton
Posted Sun Jan 6, 2013, 4:41pm Subject: Re: Portafilter lost its shine in the dishwasher
Thanks for the reply fwtechwiz. Did your portafilter look like it was plated with some shiny substance like chrome? When the plated substance came off, did it look like a dull grey? Did some metal residue rub off onto your hands or rag when this first happened? How long did you continue to use your portafilter after it lost its shine?
The shine on the p/f is not plating, it is simply highly polished aluminum. Yes, the p/f came out dull grey, and did leave a black residue on my hands and the polishing rag. The shine never came back, but once all the black gunk was off, I continued to use it for about 6 months, until I upgraded to my Evolution. Pic is attached, taken after I drilled off the bottom and converted it to naked. BTW it was one of my best shots from the cheapo Hamilton Beach. Proof that a cheap machine and a good grinder can make great espresso!!
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