Homebrew PCBs

I've seen several recommendations on throwing the FC in some cement 
mix, etc. to make a "moon rock" which you could throw in the trash 
(sorry if that's already in this thread). Seems easy enough and the 
cement powder was only 2 or 3 bucks for a giant bag at the hardware 
store last time I bought any.

FWIW- I had to resort to re-using my three "almost spent" bottles of 
FC on my last etch after calculating the amount of my new Sodium 
Persulfate crystals that I would need in order to fill my recently 
built etch tank.

Using the tank (with heater and pump), the old FC acted better and 
faster than what I was accustomed to under manual agitation and 
exterior warm water heat. It was even cut with a bit of H2O to fill 
the tank. I probably could've done without the airborne brown mist of 
FC that the bubblers put off, but I still haven't added my hold-downs 
for them or a top for the tank. Should give someone on my level way 
more time before disposal is required (and save some cash).

                                   -George