Purple etch on core steel?

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Delat

Delat

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Saw this post on IG asking about it - I’ve never seen a purple etch like this before. Anybody know who the maker is and how they achieve it?

9CF17DDE-18E4-42F9-90BB-7B91870D05BD.jpeg
 
It's a Kagekiyo, someone online said the orange etches are done by adding some copper in the wash after etching, I'd imagine something similar is done to get the purple.
 
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Does it just patina over when you use it or is it there until you grind it away on the stones?
 
Delat said:
Does the color change depending on the lighting? I’m wondering if the purple and orange pics (and your blue/black) are all the same just with different lighting.
Click to expand...
I think its just the sunlight that makes it look purple. Could be wrong though
 
enrico l said:
I think its just the sunlight that makes it look purple. Could be wrong though
Click to expand...

I was thinking that might be case since I have a coffee-etched white 2 that’s blue/black indoors but in direct bright sunlight it’s orange like rust. Freaked me out the first time I noticed, thought my knife had gotten rusty.
 
Its just a patina. Strong coffee soak will do the trick imo.
 
Sometimes when you etch with weak acids, it takes a while to get the dark color change. I sometimes etch in cycles with stuff like lemon juice, which takes a while to achieve the bold contrast. Intermediate colors along the way may include colors like this "purple. " However I think it's important to note that if you don't buff the blade after any sort of etching, the blade is going to feel very "sticky" which negatively affects performance. After buffing, there's a good chance that this purple color goes away.
 
Result of quenching in the blood of virgin maidens?

I'm disinclined to believe that it's from a coffee soak; all my coffee patinas turned out dull grey.
 
I'm simply guessing based on the available enchants out there.

Its obviously something soaked, but it shouldn't be a heavy enchant. It has to be something light and subtle. You know, like coffee.

I mention coffee because I was able to achieve this without trying. I imagine if I tried and tried found a particular coffee concentration and time ratio, I could tweak the colors.

20221208_125533.jpg
 
DanielC said:
I'm simply guessing based on the available enchants out there.

Its obviously something soaked, but it shouldn't be a heavy enchant. It has to be something light and subtle. You know, like coffee.

I mention coffee because I was able to achieve this without trying. I imagine if I tried and tried found a particular coffee concentration and time ratio, I could tweak the colors.

View attachment 221491
Click to expand...
That did turn out nice and blue. What's the cladding?

All the knives I've soaked with coffee turned out various shades of grey or black.
 
Delat said:
That did turn out nice and blue. What's the cladding?

All the knives I've soaked with coffee turned out various shades of grey or black.
Click to expand...
Wrought Iron. It effects ferrite structures and martensite differently. However, I have seen shades like this over time on both core and cladding. It was always about soak time and concentration.
 
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