I fully understand your remarks, Double D.
In fact, i didn't mention that while soaking the blade with WD-40 in the first place, i passed some steel wool and 500 grit sand paper, both in weted with the oil. The result wasn't much expressive, but i would say the dark rust (patina ?) is already leveled with the steel. But being this not a high valued piece as it is, my question was actually how to go into decisive methods, and if such operation had some interest to improve the blade look ... i mean clean it completely and after ask for a judgement on an etching procedure, if indeed some activity can be shown in this type of steel.
I will try and locate Cure-Rot anyway, it is very interesting to have at hand.
fernando
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