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Old 13th January 2018, 10:32 AM   #1
Drabant1701
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Default Etching wootz, opinion needed.

I am once again in need of assistance when etching. I have etched an indian sword in my possesion. I have etched with ferric chloride at about 30%. The sword etches very quickly, about 5-10 seconds will give it a good dark etch.

Now to the problem. There is an area that etches diffrently then the rest of the sword (see picture) the area is on both sides of the sword. I tried ligthly polishing it and the etching again, and repeated three more times. But the result was only slightly better.

I do not think it is a forging flaw. Maybe some result of heat treatment, but the why would the are around it be lighter.

I am thinking that maybe there was rust on the blade and someone sanded away the rust and this is why it looks this way.

I was thinking that if I polished the blade with starting with a rougher polishing paper 400 then upp to 2000 the blade would etch lighter but more uniform. BUT since I dont really know that that will work I am unvilling to try.

I know that there are members on this forum that has had a lot of experience with etching and I am hoping that someone has encountered something similar and is willing to share there knowlege. So In your opinion should I just leave it as is or is there a way to etch it more uniform. If I polish the etched blade it the flaw will become allmost invisible while the pattern is still visible. But we all want that dark etch, dont we
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Old 13th January 2018, 01:35 PM   #2
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Hello,

I encountered exactly the same problem a few times already. I tried etching with Nital, FeCl and even with a dilution of Perma Blue but the faded areas would stay the same.

My conclusion is that the difference is caused by some kind of heat treatment that affected the structure of the wootz.

I am attaching some photos of a Persian Kard displaying the same problem. I also have this on a Persian Shamshir.

So my opinion is that you should leave it as it is.

To what grit did you polish the sword before etching?

Regards,

Marius
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Old 13th January 2018, 01:38 PM   #3
thomas hauschild
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As a knifemaker I do not use iron3chlorid anymore. I hate that. Every little difference in degreasing and difference in heat-treating is visible and any micron rest of the acid will result rust. After lots of oil you can have a red rust if you do not take care.

I have etched some pieces of wootz with nital, which works well. Instant coffee makes a good black colour and from my experience its makes a more ph-neutral surface which will not rust so easy.

At the end I have etched some hundred blades of different damascus-steels and every blade was different. Sometimes there were great different results even if the steel was from the same billet. There was often a situation that I decided to grind the etch away and to do everything again and then the result was much better. Every none uniform quenching will result clouds in the etching (You can name it hamon when itˋs under control )

With that now visible areas on your blade it will be difficult to get a better result without grinding everything away to a shiny bladesteel. So every blade is different and it will be difficult to give you a receipt that will work 100%. Try out only light etching which will not remove much of the steel. Grind a small area with 1200 grit shiny on your blade were it is bright and dark together and try nital with some drops. Maybe you will find a solution that will work. Good luck

Best Thomas
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Old 13th January 2018, 03:24 PM   #4
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Thank you Marius and Thomas for your replys.

I polished 600 grit to 1200 grit to 4000 grit polish paper on this one. The first etching was with lemon, that worked fine. But since it showed this area of bad etching I repolished and etched the last 1/3 of the sword with ferric chloride just to see if it produced a better result on the problem area. It did not.

So I have to repolish and etch one last time. I will most likely etch it with lemon. Ferric chloride give a darker pattern but I agree with Thomas, Ferric is not fun to work with and I have had problems getting good etchings on other blades I have.

Thomas, I would love to try etching with Nital, but it is not possible to get it in Sweden.
I did not know that it was possible to etch wootz with instant coffe. I really need to give that a try. Approximately how long does it need to be emerged in the coffe for it to etch?

Thats a great looking dagger Marius, that chaotic wootz sure is facinating to look at.

regards
Peter

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Old 13th January 2018, 04:31 PM   #5
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How do you do it with instant coffee?
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Old 13th January 2018, 09:17 PM   #6
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Water and some spoons of instant coffee. It is a very slow etching. You can put a blade in for some hours without a big risk to remove too much steel. But it will etch to a deep black and you can feel a structure after a day on damascus blades. I use it everytime for damascus blades. Some weeks ago I have found a pamor lancehead on a fleemarket and the coffee worked better than ferric acid. To bring out a deep structure on my damascus I start with sulfuracid to „make the structure“ first. But the colour is often gray with that and the coffee afterwards brings out a deep black on the none nickelsteel. I do not know what the coffee makes with the surface. But the black colour seems to be relative stable against new rust. With ferric I have sometimes the first slight red rust after seconds and you are not fast enough with cleaning it. I have made some copper/iron mokume gane some weeks ago and the coffee is able to make the iron black without etching the copper. So it is a wide field for testing.


My experience with antique wootz blades is , of course, a minor experience. I do not have so much of them. 😢And as I said , each blade will etch different.
Hope I can help a little bit.

Best Thomas
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Old 13th January 2018, 09:55 PM   #7
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Quote:
Originally Posted by thomas hauschild
Water and some spoons of instant coffee. It is a very slow etching. You can put a blade in for some hours without a big risk to remove too much steel. But it will etch to a deep black and you can feel a structure after a day on damascus blades.

Best Thomas


Very, very interesting! Definitely worth a try.

Thank you!
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Old 14th January 2018, 02:41 AM   #8
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Thanks!!!
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Old 14th January 2018, 07:45 PM   #9
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Hi
There is tannic acid in coffee, and seemingly 30 other organic acids as well ( according to my quick google of “tannic acid in coffee”) I assume it is these that are doing the etching?
Ken
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