[Jewelry making - Article 00081] - Re: [Orchid] Disposing of Ferric Chloride - safety is key!

[Brian Corll]

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    Here's what I found on ferric chloride disposal: 

    The solution must not be put down the drain because of residual
    copper ions left in it. To make it safe for disposal, you can add
    sodium carbonate (washing soda) or sodium hydroxide to it to
    neutralize it, until the pH value goes up to between 7.0 and 8.0,
    testing it with indicator paper. Copper will be deposited as a
    sludge. Allow the sludge to settle, pour off the liquid, further
    dilute it with water and then it can be poured down the drain.
    Collect the sludge in plastic bags and dispose of it as required by
    your local waste authority. 

Brian Corll
Vassar Jewelers
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