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Apparently any chalk or limestone will do. I did a search for the stuff I was given but no idea if it is specialist stuff. Swarf, yes the small bits of metal that come from the filed tooth.

Yes, his does both sides but is not as spangly as that one. This video might work.

Sean, it stops the file dulling prematurely and keeps swarf out of the file. Edit: doesn’t stop it dulling early, but just feels like it does due to the chalk keeping the swarf out.

I have started using chalk on the files. Seems to make the file bite better and last longer and not fill with swarf. Same guy who has the grinder shares the yard with a guy who is a fitter and fabricator/machinist. He always uses chalk when cutting metal.

One of the guys I work with has a similar machine from Sweden. I was sceptical at first about the hardening etc. But holy shit Batman. His saw will cut. Sometimes he runs the chain 2 or 3 times through, taking just enough to make sharp but not blueing the tooth. I can get a decent edge...