Black Marks on Blade
QUESTION: My grandfather has a British Naval Officer's Ceremonial Sword. This sword is in fairly good quality, except for a few black marks on the blade. Polish does not seem to work, and I was wondering if you know of any ways of removing these blak marks, without damaging the blade, which is inscribed.
It sounds like some deep patina, which isn't necessarily a bad thing on an older sword and actually adds character. Cleaning it up with some polish is about as far as you want to go, there are other methods, but they cannot really be attempted just from some info obtained online - if done improperly it would do a lot more harm than good...