Question re: sk-5 carbon steel

Joined
Jan 26, 1999
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I have an assegai thrusting short spear with a SK-5 medium carbon steel blade. What does the SK-5 designation mean? Could someone tell me whatever they may know about this type of steel? Also, the blade has a black coating. What is the coating composed of, and how would you recommend taking care of the blade without damaging it?
 
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