[Jewelry making - Article 00406] - [Orchid] Ferric chloride in etching.

[ARands]

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    Got some ferric chloride from Radio shack, and it  was great for
    just etching one piece of copper ( 4" x 4"),  Tried to use the same
    batch for another etching of a piece the same size, and  only got a
    very feeble  etch.  After 8 hours still not  much going on.  Then
    finally decided  to go to bed and  checked it the next morning.  The
    ferric chloride had all crystalized, and the etch was still feeble. 
    Cleaned  the mess off and got a fresh bottle (from radio shack), 
    great for one etch, lousy for the next.  My questions are::   How
    many times can one use the same batch???,  Is there a shelf life for
    Ferric chloride??  Can it be  that mine  was old???   What about the
    strength. Does ferric chloride come in different strengths?  ( I 
    used  it full strength, but could it be that the stuff from Radio
    shack is diluted???) Lots of  questions  I know, but I am sure that 
    with your  combined wisdom, you will solve my problems.  Thanks a 
    million (and special thanks to Hanuman for making all this possible)- Alma

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