Oh yes, I didn't mention the nickel question.
Many old Javanese keris do not contain nickel, but that does not mean that the pamor has no contrast. The contrast is provided by "white iron" = high phosphorus content iron. This white iron was a local product and was not suitable for tool or weapon production, so it was combined with the more expensive irons, mostly imported, to provide a usable product, the end result being pamor. This type of pamor does not jump up and bite you, like 19th century Bali pamor, but there is nearly always a sufficient degree of contrast to allow it to be clearly seen.
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