The bolts are stainless steel, they should not require lubrication.
Yes, lubricants can stain the micarta, particularly if allowed to "sit" without being wiped off.
When the handle is prepared for the bolts, it exposes the linen or canvas making "lighter" in appearance. Not unlike the counter sink for an unlined thong hole.
The handles are buffed only at the shop. No "treatment" is used.
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