Rust on Treat blades

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65
Ive a Treat blade in my head razor and a Permasharp in my face razor. They've both been used for 3 shaves and stored identically.
The Treat blade has rust near the cutting edge and the Permasharp doesn't.
When shoul I worry about the rust?
Is it normal for some blades to rust faster?
 
Whuddathunkit.

I had no idea what PIA carbon steel can be until I bought a Mora Bushcraft Black knife. Most useless knife in the house, I can't cut a tomato, or any food for that matter. It has to always stay covered in machine oil. God forbid I open a can of something with it, the edge might chip.
 
I had no idea what PIA carbon steel can be until I bought a Mora Bushcraft Black knife. Most useless knife in the house, I can't cut a tomato, or any food for that matter. It has to always stay covered in machine oil. God forbid I open a can of something with it, the edge might chip.

Just coat it with olive or mineral oil.
 
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