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R_a_feldman
Tinkerer
Username: R_a_feldman
Post Number: 7
Registered: 11-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 17, 2009 - 10:22 am: | 
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I have an old Japanese wooden half plate field camera (an Okuhara). There is some blue-green corrosion on the heads of the flat-head brass screws where they hold crome plated steel to the wood.
What is the best way to (1) remove the corrosion; and (2) prevent it from reoccurring? |
Sevo
Tinkerer
Username: Sevo
Post Number: 35
Registered: 09-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 17, 2009 - 02:03 pm: |
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There are acids and resins in the wood which may cause it. I simply clean them in a ultrasonic cleaner, and replace badly corroded ones as neccessary.
Chrome or nickel plating should stop the corrosion, but I'd only do it on covered screws, or where there already is a jumble of plated and unparted parts on the camera. |
Rlc
Tinkerer
Username: Rlc
Post Number: 66
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 17, 2009 - 04:41 pm: |
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Two products I have used and can recommend:
SIMICHROME or WENOL.
They can be found at your local hardware store or on eBay.
After polishing to a high lustre apply a tiny drop of clear lacquer or clear fingernail polish. this will last for years.
Richard. |
Gez
Tinkerer
Username: Gez
Post Number: 53
Registered: 09-2007
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 17, 2009 - 07:22 pm: |
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The blue corrosion products are mainly copper carbonate and dissolves readily in ordinary vinegar. The clear stuff is the best. |
Courtneydawg
Tinkerer
Username: Courtneydawg
Post Number: 2
Registered: 03-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 18, 2009 - 05:13 am: |
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My old camera had this.
You just clean it with germ-x every couple of days and it will start to wear off. |
Paul_ron
Tinkerer
Username: Paul_ron
Post Number: 142
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, March 22, 2009 - 06:43 am: |
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NOXON will polish brass. |
Prasanna
Tinkerer
Username: Prasanna
Post Number: 14
Registered: 10-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Saturday, October 24, 2009 - 09:30 am: |
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Household Ammonia will remove the acidic etching and greening. It would also brighten the brass. You could then polish it with Brasso and apply clear acrylic varnish or clear nail polish on it. It will stay bright for long.
I do that when I renew old Fountain pen clips that are made of brass. Regards, sp. |
Marty
Tinkerer
Username: Marty
Post Number: 38
Registered: 11-2008
Rating: N/A
Votes: 0 (Vote!) | | Posted on Sunday, October 25, 2009 - 06:33 am: |
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Simichrome, and similar products in a tube work very well. I'll soak 'em in vinegar if they require TOO much elbow grease, and then lightly polish. I really haven't had much problem with the corrosion returning. (Does simichrome have a little wax in it too?) |
