Sorry my statement wasn't clear; I was trying to add a touch of humor.  I
saw in earlier posts that Plaster of Paris would neutralize the ferric
choride, but I didn't know if you just got neutralized sludge, or whether it
would harden as the plaster would have normally.  I figured if it hardened
(into a "brick"), then you could put it in the trash, thereby annoying the
landfill guys, rather than putting it down the drain, and annoying the water
treatment guys.  I see that nowadays you have to present it to a recycling
facility, which doesn't surprise me.  But I think I etched my last board in
1987 or so, so I don't suppose it matters all that much here.  Now I work
for people who get boards made and then give them to me :)
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