I have tried etching my blades using the same method vinegar and lemon and I got the same result as yours. Try using a stronger solution like PCB, it works just fine for me specially on those stubborn Barong patterns that are hard to etch, it might work on your beautiful 18th C Kris. I am attaching two of mine that was PCB etched. I the first one had a very grayish dull pattern with vinegar and lemon, when I switched to PCB it gave me the pattern that I was looking for. Good luck.
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