Daniel,
I don't think you should stain the blade to make it less obtrusive. You stain the blade or not. But If you do, you have to clean the blade completely and remove the rust. When you etch the blade with warangan the blade will turn completely black without pamor, as Alan already said. Such pamorless keris is called kelengan.
I think this pamor batik is made to give the keris more value for the ignorant buyer (read tourist).
If I'm not mistaken the pamor in batik is pamor Bendo Segado.
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