On my users that are plain steel, I get them to "blue" with lime juice or tomatos or something of that type (onions too) some people use mayo. It gives them some protection as it is like "pre-rusting" them at a determined rate. Seems to cut down on some of the maintainance. I still dry them before putting them up though...
All simple carbon steels will rust and stain, if not protected or fastidiously cared for. And 1050 is certainly the most simple of carbon steels. Iron, and 0.50% carbon, and 0.6% to 0.9% manganese That's it.
This stuff will develop rust spots even indoors unless you wax the blades. It's not a problem indoors, you just wax.
Used for much of anything, they stain.
[This message has been edited by rdangerer (edited 02-08-2001).]