I'm not going to comment specifically on the blades pictured, but if we look at the pale pamor material in the pedang we can see little white specks.
When we find a lot of these in ferric material it is very probably caused by forging at low temperatures. Prof Jerzy Piaskowski of Poland conducted a number of analyses of this type of material and this was the conclusion to which he came.
The effect can be quite impressive in a blade that has only plain steel and no contrasting pamor, it looks like little white clouds floating below the surface of the iron or steel, almost three dimensional.
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