Re-etching a BK11CSM?

[NJBillK]

What's going on folks?
I have a BK11csm that I want to drop the spine a bit on, but I am curious what I would use to etch the core again?
Ferric Chloride? Muriatic acid?

I don't want to etch deeply, just darken the core.
From what I have read, I think that would cross out Muriatic acid since it etches more and darkens less, correct?
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Current photo:

I would like to etch the core back to being similar to this since the core shows through the spine.
Thanks!

 

[NCSlice]

This is differential treated 01 before and after using FCL. I dabbed the acid onto a paper towel then rubbed the FCL onto the blade trying to make sure it was wet because it seems to dry quick. I don't have a lot of experience with FCL but I've done a few carbon steels this way.





The hardened area darkened up a lot. Worst case would be buffing it off if ya don't like the results
Good luck, and report back!

 

[Stacy E. Apelt - Bladesmith]

FC should work fine.

 

[Tankerwolf]

I have used MA with two csm's with great success. 15-20 minute soaks at a time and wash off with baking soda in between until it's as dark as you want it. Will post a pic of one of them after work so you can see how it turned out. I've never used FC though so it may be better.

 

[NJBillK]

Thanks guys, much appreciated.

 

[Tankerwolf]

Not very good pics but this was shortly after MA and convexing after.

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It almost gave it a sort of stonewashed look. I like it. ymmv.

 

[Stacy E. Apelt - Bladesmith]

Since he only wants to darken the core, I still suggest FC. Muriatic would affect the whole blade.