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post #1 of 18 Old 01-25-2016, 08:46 PM Thread Starter
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Ageing Brass

OK I have a couple of sets of double pin brass hinges ( that I picked up at Rockler) for a woodworking project I'm on.
Soaked them in acetone for a couple of hours figuring that would take off the factory finish.
Then I suspended them overnight in a sealed canning jar with maybe an ounce of ammonia .
Nutin notta didly squat happened.....except my sinuses are clear
......P U.

Knot Stumped ...just confused once in a while.

Last edited by Tree Hugger; 01-25-2016 at 08:48 PM.
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post #2 of 18 Old 01-25-2016, 08:59 PM
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Acid would probably work better. Maybe an overnight soak in vinegar? Hitting the hinges lightly with a blowtorch may also work

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post #3 of 18 Old 01-25-2016, 09:08 PM Thread Starter
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Good idea Epic ...I know I have some propane or mapp around here someplace.
Though sure the acetone would have cut it though.

Knot Stumped ...just confused once in a while.
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post #4 of 18 Old 01-25-2016, 10:50 PM
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post #5 of 18 Old 01-26-2016, 03:11 AM
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Originally Posted by Tree Hugger View Post
Good idea Epic ...I know I have some propane or mapp around here someplace.
Though sure the acetone would have cut it though.
No dice unfortunatly. Acetone, while a rather harsh solvent, doesnt do much to metal. It is fantastic for cleaning it though.

Fun fact, that i didnt know until i checked a minute ago, acetone is pH neutral, which is to say its neither an acid nor a base, like water. Completely unrelated, i just thought that was cool

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post #6 of 18 Old 01-26-2016, 08:18 PM Thread Starter
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I figured the Acetone would dissolve any clear finish that was on it ( so the ammonia could work )...maybe there wasn't any finish , it did look shinier after.
Looks like the torch got the ball rolling . After cooling they went back in the sealed jar with ammonia.
If that don't go far enough I have some vinegar to try also.
Shoot, Rockler has there own darkening solution .....that would be the easy way.

Knot Stumped ...just confused once in a while.
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post #7 of 18 Old 01-26-2016, 09:06 PM
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If you have any Stained Glass studios and/or suppliers around, they have different liquid agents available to age copper, brass, lead, etc. just wipe it on and it works pretty quick.
Mike Hawkins
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post #8 of 18 Old 01-26-2016, 09:39 PM
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Quote:
Originally Posted by Rockler

Ingredients:
H2O - Over 97.6%
Other ingredients - Less than 1% each

Chemical Family:
Dilute Aqueous Acid
So Rockler's stuff is an acid of some sort (and lots of water), if that helps you any.

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post #9 of 18 Old 01-26-2016, 10:39 PM
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The brass darkening solution isn't something that you have to work at or it takes a long time. The stuff works so fast you have to be careful not to get it too dark. You just have to be prepared to rinse the stuff off quickly. It's true the hardware is probably coated with some clear coating that would have to be removed first. It may have a lot of water in it but there is enough chemical in it to turn brass black in a hurry.
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post #10 of 18 Old 01-27-2016, 03:43 AM
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Quote:
Originally Posted by Tree Hugger View Post
I figured the Acetone would dissolve any clear finish that was on it ( so the ammonia could work )...maybe there wasn't any finish , it did look shinier after.
Looks like the torch got the ball rolling . After cooling they went back in the sealed jar with ammonia.
If that don't go far enough I have some vinegar to try also.
Shoot, Rockler has there own darkening solution .....that would be the easy way.
I wouldn't imagine ammonia would do anything. Its pretty basic (chemically basic that is), and bases don't really do anything to metal. The vinegar would be a better shot, being an acid

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post #11 of 18 Old 01-27-2016, 06:35 AM
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they are probably clear lacquered

Quote:
Originally Posted by Tree Hugger View Post
OK I have a couple of sets of double pin brass hinges ( that I picked up at Rockler) for a woodworking project I'm on.
Soaked them in acetone for a couple of hours figuring that would take off the factory finish.
Then I suspended them overnight in a sealed canning jar with maybe an ounce of ammonia .
Nutin notta didly squat happened.....except my sinuses are clear
......P U.
You have to strip or burn off the clear coat before any aging will take place..... paint stripper or Mapp torch.

Yellow mustard works to "etch" steel. It may also work to age brass... I donno. Probably has a mild acid?

Epic, take a look at this for your knife blades:
https://www.youtube.com/watch?v=hfRO1GbvOvA

https://www.youtube.com/watch?v=uDjS9iob5NQ

The answer to your question will only be as detailed and specific as the question is detailed and specific. Good questions also include a sketch or a photo that illustrates your issue. (:< D)

Last edited by woodnthings; 01-27-2016 at 07:01 AM.
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post #12 of 18 Old 01-28-2016, 12:14 AM Thread Starter
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I knew I should have taken chemistry back in high school ...Ha after 40 yrs probably wouldn't have remembered any of it if I did.
Just poked around on the internet thingy and came up with ammonia and vinegar was another.
Having flashbacks of watching Grampa Munster working in his LAB OR AT OR EE ...heh heh
Anyways it worked after 2 days in the jar ...have to get a pic up tomorrow 4:00am comes up real quick.

Knot Stumped ...just confused once in a while.
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post #13 of 18 Old 01-29-2016, 12:09 AM
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I knew I should have taken chemistry back in high school ...Ha after 40 yrs probably wouldn't have remembered any of it if I did.
Sounds typical. If I'm forced to learn something I don't remember it for 40 minutes. But if I have a use for the knowledge, now we're talkin'.

~Mark

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post #14 of 18 Old 01-30-2016, 08:46 PM Thread Starter
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Interesting videos on the mustard ...have to file that away for future reference. ....Must be the vinegar in the mustard that does it
Here is the picture , 48 hrs in a sealed jar hanging above an ounce of ammonia.
I'll have to try the vinegar next time and even the mustard has got my interest up.
Shoot if I had only known all these years not to put mustard on my brats I would still look like a youngster.


Knot Stumped ...just confused once in a while.
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post #15 of 18 Old 01-30-2016, 09:42 PM
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I had an old brass tp holder that was polished brass. Our bath hinges and knobs were "antiqued" brass finish.
I suspended the tp holder over some ammonia we had, and it made the brass, look just like the bought "antiqued finish" hinges. It was the first time I had done it and I was amazed.
Maybe the brass alloy is different?
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post #16 of 18 Old 01-30-2016, 11:04 PM Thread Starter
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I'm not sure what the difference is in plating vs solid brass but brass is an alloy of copper and zinc.
What I did not know and was informed of from a brother in law at a get together last weekend is that brass has a minute amount of lead in it.
He has worked at an aluminum and brass foundry for around 40 years.
Lead is put in for machinability.
They have found out that everyone has elevated amounts of lead in there blood.
OSHA has levied fines , they have put in more ventilation and are using respirators , ect.
Fortunately his isn't that bad ( compared to some ) but he wants out and is talking of early retirement.

Knot Stumped ...just confused once in a while.
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post #17 of 18 Old 01-31-2016, 12:57 AM
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Quote:
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Shoot if I had only known all these years not to put mustard on my brats I would still look like a youngster.
Yeah, but what kind of life would that have been?

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post #18 of 18 Old 01-31-2016, 08:17 AM Thread Starter
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Heh heh ....ya got me thinking

Knot Stumped ...just confused once in a while.
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