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@provenrad
Crayon is to mark the hole in the tube (cocktail stick works too).
The chalk is to be used with the sandpaper (or the ridged section on the bottom of the repair kit) to dust the patch area and prevent the excess glue from sticking.
Myself, I'm not too proud to collect abandoned tubes from around the benches of Richmond park - I keep patching until the punctures start overlapping or start to occur too often.