Hi Grapevine
I say like rev jch, that is also my experience of making knifes (spearheads, arrow heads and so on) of files..
My experience is that some type of file-steel rust very easy but other do not. I think there are many different types of steel in files, perhaps depending on where they are produced. Old files rust more easy compared to new ones.
If you do not reheat them, they can not be used in really hard work, they can broke, not only in 2 pieces, they can broke in many pieces, more or less explode. Thats how, and why, I learn to reheat them.
Some learn the intelligent way
others learn like I do
If the teeth are there or not is more or less a question of design, not how the knife performs. The teeth is of cause collecting dirt of all kind, and also rust, but if you use oil on the blade the problems is not so big.
It is better with out any teeth marks of hygienic reasons.
The picture shows a spearhead made by a dagger formed file.
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Regards
Thomas