Forcing a Patina on Spyderco Knives with K390 Steel
Let’s say there are some Spyderco Knives in your collection that have K390 steel blades, such as an Enuff 2. This is a great steel and one that is very tough and hard. It will hold an edge for a long time.  There is just one real tradeoff. This alloy will rust.  The upside of this is that steels that will rust will often patina beautifully. Here’s what you need to know...
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