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Thread: Ferric Chloride Question

  1. #1
    Join Date
    Sep 2009
    Location
    Parks, AZ in the mountains outside of Flagstaff
    Posts
    45

    Ferric Chloride Question

    Ed,
    A couple of questions for you about ferric chloride.......

    Does FC wear out? Other than it loses its effectiveness, is there a way to tell?
    Does it have shelf life?

    My FC has a percipitate/sludge in the bottom and is somewhat milky.



    Just wondering if it needs to be replaced or filtered or ????

    Thanks
    Steve Hostetler

  2. #2
    Join Date
    Sep 2009
    Location
    Great Falls, Montana, USA
    Posts
    1,643
    Hi Steve!

    In my experience it will "wear out". About the only way to tell is when it just seems to stop working. The "sludge" at the bottom is normal, but the "Milky" is not! Etchant that looks "milky" generally has been contaminated with something.....most often some type of oil. I once wrecked a newly mixed tank of etachant because I had left the lid off of it, and sprayed something with WD-40 about 2 feet away from it.....just a few drops got into the tank, and that "milky" appearance showed up. As far as I can tell, there is NOTHING you can do once it's contaminated, except to dump it, clean out the container well, and mix a new batch.
    Just about anything can contaminate Ferric.....oils are the worst, but if the container isn't kept covered, various dusts, grits, or whatever can get into it and wreck it.

    www.caffreyknives.net
    Caffreyknives@Gmail.com

    "Nobody cares what you know.....until they know you care."
    Visit me at Table 2R at the Blade Show!

  3. #3
    Join Date
    Sep 2009
    Location
    Parks, AZ in the mountains outside of Flagstaff
    Posts
    45
    Ed,
    Thanks for the info. Looks like its time for some new FC..

    Regards,
    Steve

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