sf wrote:
>
> On Thu, 24 Jan 2013 10:16:09 -0800 (PST), Kalmia
> > wrote:
>
> > Is it the d/w 'soap'?
>
> That gray stuff is just a coating, I guess whatever the abrasives are
> in d/w detergent will make it wear faster. I never put my pots and
> pans in the dishwasher so it's a non-issue for me.

Anodizing is not a coating, it is an electro-chemical finishing process
that essentially builds an extra thick layer of hard aluminum oxide on
and into the base aluminum. The thickness of the anodizing develops in
both directions i.e. half of the thickness builds into the base metal
and half out from it. All aluminum builds up an aluminum oxide layer
naturally, anodizing deliberately builds it thicker than naturally
occurs.