Posted by Kazuhiko Ichikawa on November 17, 2019 | 4 Comments
 

Keum Boo on copper is a bit tricky because copper is easily oxidized when it's heated.

So you need to de-oxidize the surface using a torch.

Flame is an excellent reductant.

The preparation is exactly same as the usual Keum Boo but you don't need to do depletion gilding.

The point is brushy falme and de-oxidization by it.

I mean flame has 3 functions in this case.

1. Heating

2. Eliminating oxygen from the oxidized copper.

3. Protecting copper from oxidization.

When the oxidized copper is de-oxidized, the surface becomes fresh copper-pink. So you can know it's time to push the foil.

In this video I only show the first Keum Boo but actually I did it 4 times including fixing.

After Keum Boo is done, I applied LOS patina slightly and wiped it out a bit and sand blasted and then applied Renaissance Wax.

Comments

Anonymous
November 27, 2019

You spoke of using glue to attach the silver foil to the copper before heating. Are you meaning flux or is there a specific type of glue to use?

My second question is do you have any problems with tearing the silver foil during the burnishing process while you are fusing it on? I would assume the foil is pretty delicate.

Thank you!

Kazuhiko Ichikawa
Kazuhiko Ichikawa
November 27, 2019

Thank you for asking.
This video is provided upon the assumption that you already know how to do usual Keum Boo.
If you don't know how to do Keum Boo, please watch this video.
https://www.kaznesq.com/blog/how-do-keum-boo-my-method

I also suggest Rio Grande's video that you can find in Youtube.
The glue I use is Yamato Arabic Glue but they say they use tragacanth gum.
The silver foil is thick enough so that you don't tear during the process.
It's not leaf but foil.

Anonymous
April 10, 2022

Thank you for your wonderful videos and sharing your talents. I have found some really helpful tips in watching your videos. I have been wanting to do Keum Boo and on copper as I just love the color. So, your tips on using the torch are invaluable to me. As well as how to do a beautiful job with the LOS.

Kazuhiko Ichikawa
Kazuhiko Ichikawa
April 10, 2022

Thank you for your comment.
Keum Boo on copper is a bit tricky.
I suggest you should watch the copper color under the flame carefully.
Keep it beautiful copper pink, It's the sign that the copper is not oxidized.
Good luck.

Kaz

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