You won't be able to find Arsenic anywhere in Europe or US since it is labeled as poison.
I have experimented with ferric chloride, Nital and Perma Blue, but nothing worked right (albeit they work quite well for etching wootz or normal pattern welded steel). So I ended up sending my blade for a reasonable sum back to Indonesia where it received the right treatment and got it back in stunning condition.
I suggest you ask Seerp Visser a about his method of etching Keris blades. While I didn't test it myself, I remember seeing his blades and one could swear they are traditionally etched.
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