
Originally Posted by
stumpstalker
#1) Dark patina and active rust are as different as night and day. The former protects the metal from deterioration, and scraping, buffing out, that is, removing it, will deprive the metal of the "armor" that has taken time protect it. Wanting the knife to look shiny and clean, by removing patina, re-exposes the metal.
Red, active rust is a different animal. It should be stopped. Try D-40, and gentle removal afterwards with such as a razor blade, working slowly and carefully.
#2) "BARLOW" is a generic style, or type of knife, and many good ones have (or had) issued from Solingen, Sheffield, and American manufactories over nearly two centuries. The bolster at the top of the knife, where the blade or blades are pinned usually announces that it is a Barlow with a deep stamp. Not that it matters, if for sentimental reasons you value the knife anyway, but the brand of the knife, that is the factory that made it or the distributor involved, should be stamped on the tang of the blade. For a collector, that can mean much as to desirability. But as said, that should be of secondary interest if one is restoring an heirloom.
3) Barlow knives were ruggedly made, distinctive with their longer than normal top bolsters, and usually unadorned by such as heraldic shields that in many other traditional knife styles were embedded in the handle covers. Barlow handle covers were likely to be unembellished sawn-cut bone.
Now you have a great daily reminder of your grandfather. Do use and enjoy carrying it.