![]() |
![]() |
#1 |
Member
Join Date: May 2008
Location: Czech Republic
Posts: 841
|
![]()
Hello, I wonder If I may ask for an advice:
How concentrated should the solution be ? How long time should the blade be plunged ? When removed from the bath, should the blade be slightly (by cloth) repolished again ? Any potential risks ? Thanks Martin |
![]() |
![]() |
![]() |
#2 |
Member
Join Date: Apr 2005
Posts: 3,249
|
![]()
Hello Martin,
Please search this site for several detailed tips. Just a few comments: Concentration is not so critical but make sure you don't overdo things! Evenly wipe the solution over the blade (repeatedly - the reaction is usually pretty fast though). Start with a weak solution and increase the concentration if needed. FeCl3 is a strong, agressive etchant: apply as short as possible, neutralize very carefully, and wash off generously. Make sure the etching solution touches the blade only and protect all fittings! Ferric chloride will dull a steel surface quickly. After a first exploratory etch, one stragegy is to repolish by hand and follow up with a very quick final etch. Any traces left on the blade or other parts will keep being corrosive forever - be very careful with applying the stuff and, especially, removing the etchant completely. Regards, Kai Last edited by kai; 17th October 2014 at 06:15 PM. |
![]() |
![]() |
![]() |
#3 |
Member
Join Date: May 2006
Posts: 6,819
|
![]()
Good practice is to kill the etchant with a slurry of bicarbonate of soda.
Blade must be absolutely clean and free of oil or grease prior to commencement. Warm temperatures speed reaction. |
![]() |
![]() |
![]() |
#4 |
Member
Join Date: May 2008
Location: Czech Republic
Posts: 841
|
![]()
Thank you both.
I hope covering of gilding with zapon lacquer will be sufficient. Is there slight polish necessary after the final short etch (and neutralization), or this final polish would destroy the optical result ? Thank you. Martin |
![]() |
![]() |
![]() |
#5 |
Member
Join Date: Dec 2004
Location: Kernersville, NC, USA
Posts: 793
|
![]()
I have etched a lot of blades, but I'm no expert. My method is in this thread.
Etching I have read that doing the first neutralization with vinegar converts some chloride ions to a non corrosive form. (I'm no chemist) I then rinse and neutralize with ammonia, then with a slurry of sodium bicarbonate. I've never had any corrosion or rusting issues doing it this way. Good luck sir! |
![]() |
![]() |
![]() |
#6 |
Member
Join Date: Nov 2013
Posts: 456
|
![]()
How polished should a blade be before you etch it? Does it need a mirror finish?
If you etch a blade that's been cleaned and not polished and no pattern emerges (steel just turns uniformly gray) is it possible that you'd get a pattern if you put a mirror finish on the steel and tried again? Or would you at least see some evidence even without the polishing? |
![]() |
![]() |
![]() |
#7 | ||
Member
Join Date: Apr 2005
Posts: 3,249
|
![]() Quote:
Quote:
Regards, Kai |
||
![]() |
![]() |
![]() |
#8 |
Member
Join Date: Dec 2004
Location: Europe
Posts: 2,718
|
![]()
As it has been mentioned, FeCl3 is very agressive, so you have to be careful.
Some time ago this was discussed, and some suggested anything from pineapple juce to lime juice. I find that ferrycloride is very good, but maybe you should try it on a blade of less value, so you know what happens, as you can always remove it, but just to make sure you know how it works. Make sure you have the neutralisers at hand before you start. You may end up with a blade slightly yellowish, but this can be removed by adding acid free oil and work the blade over with very fine steel wool - very gently. Good luck Jens |
![]() |
![]() |
![]() |
#9 | ||
Member
Join Date: Apr 2005
Posts: 3,249
|
![]()
Hello Steve,
Yes, your etching results are certainly fun - keep them coming! Quote:
The vinegar may help to remove excess iron salts (if you leave it on for too long you'll reduce the contrast of the stain though) and, thus, avoid the yellowish color which is often visible in blades treated with ferric chloride. Quote:
Once you have neutralized any traces of acid, you really need to rinse away any salts/ions. Deionized water, lots of DI water! Regards, Kai |
||
![]() |
![]() |
![]() |
#10 | ||
Member
Join Date: Apr 2005
Posts: 3,249
|
![]()
Hello Martin,
Quote:
If a blade with koftgari/etc. has not been cared well for, chances are that you'll loose some or even all of the gold by removing rust that may have developed below the koftgari and even next to the inlay. Please post close-ups of the piece of interest and I'm sure the specialists can give you some pointers. This really needs to be explored on a case by case basis; and with lots of patience and expertise! Quote:
In general, polishing after the etch will result in lower contrast; buffing a protective topping of renaissance wax may be enough to get the blade shiny. In a perfect world, you'd not have to polish again if the etch was spot on: better etch a bit too shortly rather than too long resulting in a dull blade. Regards, Kai |
||
![]() |
![]() |
![]() |
#11 |
Member
Join Date: Dec 2004
Posts: 1,712
|
![]()
Protect the kofgari areas with wax,{melted then solidified.} then just etch the unprotected areas with a repeated brush wipe, rather than risking dipping.
I don't like Fc myself, I prefer sulphuric,, lemon, vinegar & pineapple mostly, but FC is very popular on this forum. ![]() Only etch when you have uninterrupted time, turn your phone off & don't answer the door! ![]() spiral |
![]() |
![]() |
![]() |
#12 |
Member
Join Date: May 2008
Location: Czech Republic
Posts: 841
|
![]()
Thank you all for your (for me) very important advices and Good Lucks !
Unfortunately, miracle did not take place and I found out that the blade was made of, I would say, normal steel (there was some parallel lamination, but always accompanied with relatively deep pitting, so I better polished it again after three very quick attempts. Very important was the piece of info from Spiral "to have uninterrupted time, turn your phone off & don't answer the door!". But when I cut my finger and the result was not "slightly yellowish", but "reddish", it was like phone ringing and at the door knocking etc altogether. This is also the sword from this thread: http://www.vikingsword.com/vb/showthread.php?t=19145 And Here are the requested close ups - but as I said, no "damascus". Thanks once more Martin |
![]() |
![]() |
![]() |
#13 | |
Member
Join Date: Dec 2004
Posts: 1,712
|
![]() Quote:
Mmmm so the hilt straps are re built by the same chap who made the scabbard it seems? If blade was mine Id give it a little go with pineapple juice to see if that brings anything else out.... not all etchants work equally on all blades in my experience. ![]() spiral |
|
![]() |
![]() |
![]() |
#14 |
Member
Join Date: May 2006
Posts: 6,819
|
![]()
Here are three knives that I made.
My apologies for the slight reddish cast, these are super-quick pics and I'm wearing a red checked shirt. The blades are mechanical damascus, the Marbles ripoff is 01+mild, the puuko and the trout/bird are 01+mild+nickel. The topographic etch was done with hydrochloric acid (pool acid). The colour stain was done with ferric chloride (FeCl3 - 42%). After the colour stain they were let sit with a brushed on slurry of bicarbonate of soda for about 10 minutes, this was washed off, they were thoroughly dried and sprayed with WD40. They were all brought to a high hand polish prior to the topographic etch, and polished again before the colour stain. After the colour stain with ferric chloride they were lightly polished with worn 1200 W&D paper, then 0000 steel wool. They were then sprayed with WD40, allowed to dry overnight and waxed with Antiquax. The stain job was done over the laundry tub with a glass of ferric chloride and a toothbrush, the water was left running, the ferric chloride was continually applied and washed off until the colour I wanted was reached. They were made about 20 years ago and have been sitting in a drawer wrapped in cloth since then, which I think demonstrates that we can store blades for extended periods unattended if the preparation is correct. I've etched and stained more damascus, like this stuff shown, than I can count. I've cleaned and stained more keris and other SE Asian blades than I can count. I've never stained any Indo-Persian blades, but I cannot imagine that the process would be much different to that of staining any other mechanical damascus. Wootz might require a different technique, I don't know about this stuff, I've never cleaned nor stained it. Pineapple juice, when it is good, is a great cleaning agent. It is a lousy etchant and a lousy staining medium. |
![]() |
![]() |
![]() |
|
|