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Originally Posted by ariel
That's interesting! How much do you dilute it?
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I started from Perma Blue which is based on Selenium Dioxide and Nitric acid, which I already had diluted to about 20%. (At this concentration I etched an Indian Katar that I didn't manage to etch with the classic Nital and Ferric Chloride (even this concentration blackened the Katar completely but upon gentle wiping with Pre-lim, I got a very nice an visible watering wootz structure).) Then I diluted this even more to about 10%, but I only got a nice and uniform grey patina that didn't reveal the pamor even after selective cleaning with Pre-lim.
PS: I used undiluted Perma Blue for blacking an antique Japanese Tsuba with stellar results, and that's how I had it on hand to experiment with the Wedhung.