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Fukurin attachment


Stephen

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The fukurin is normally formed in place and then soldered in place. The patina is added after the soldering is completed. Sometimes one or the other is masked to prevent the patination solution from coloring the other part(s).

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45 minutes ago, 1kinko said:

The fukurin is normally formed in place and then soldered in place. The patina is added after the soldering is completed. Sometimes one or the other is masked to prevent the patination solution from coloring the other part(s).

 

Thank you.  Was this the traditional method?  I'm just wondering how they precision soldered without modern electric soldering tools, including masking without adhesive tape.  It's pretty impressive they were able to achieve such nice and even rust patina on the iron surface -- which I think usually involves some heat to speed the reaction -- without undermining the integrity of the soldered parts.

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Fukurin start off as flat strips of thin metal, they are accurately shaped like a frame around the outside of the tsuba and then silver soldered close.

Only then is the 'frame' fitted to the tsuba and the overlapping edges of the frame gradually cold worked down onto the surface of the tsuba plate.

On iron tsuba this would be done after the iron patina has been fully developed.

 

You'll find a series of images showing this process here:

https://photos.google.com/share/AF1QipPDjMsj6e4pIjnu5RaoPG693ANz-JBM9ERTXnHs1_Lf34RmDP1k3u8nU8di-yShHQ?key=NHF6N0VTb0J4anlJZ1lQWjhyeE1VQm9EQVltLW13

In this case it's a shakudo fukurin on a yamagane-like base plate but the procedure on iron would be exactly the same.

 

This is also why we often encounter applied rims that are a little bit loose, it's very tricky to close the edges inwards without the outer edge stretching a little bit.

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