Homebrew PCBs

I have about 1/2 pint of used ferric chloride. I put it in a pint plastic
containers and mixed in a lot of baking soda. It is now a thick brown paste.
Our city has a hazardous waste collection day but I figured this stuff might
be trouble so called ahead. After a few hours, they called back and said no,
they can't take it. So what else can I do to make it safe for disposal in
the garbage?

 

Thanks,

 

Rick



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