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Thread: black annealing stains on copper

  1. 06-11-2013, 05:50 AM #1
    yonky
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    black annealing stains on copper

    hi,i have just had some copper coil annealed to soften it,it has come back black,anyone got any idea how i can remive the black stains?

    thanks ian
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  2. 06-11-2013, 06:04 AM #2
    Hickory
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    What form is the copper in?
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  3. 06-11-2013, 07:12 AM #3
    yonky
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    Quote Originally Posted by Hickory View Post
    What form is the copper in?
    its in coil form at the moment but will be pressed into 30 cal gas checks
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  4. 06-11-2013, 07:21 AM #4
    Sasquatch-1
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    For brass I use a crockpot and citric acid. Cook the brass for about two hours and then into the tumbler with a little IOSSO brass cleaner. After you get it punch into gas checks this should work well.
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  5. 06-11-2013, 03:29 PM #5
    ph4570
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    I have annealed Hornady GCs. They develop a flaky black surface. I put them in the ultrasonic cleaner with dish detergent and citric acid. They come out fine. I do not know if this is the same staining you are seeing But I would wager the same cleaning method would work.
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  6. 06-11-2013, 06:25 PM #6
    Dan Cash
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    Why worry what they look like; gas checks are expendable.
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  7. 06-11-2013, 06:54 PM #7
    mold maker
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    Until you bury them in a powder filled case, they look terrible. The next time you view them, their toast.
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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check