Tom mentions ’shoe polish’ though in the UK at least that would refer to the
coloured wax stuff. Don’t use that (though it has its place on the shelf - I’ve
just used some on a figurine) What you want is ‘leather dye’ - which is just
stain as we all know nd love, but tasked for leather. Soaks in and stays in,
unlike polish, which is a thin layer on the surface to make leather shiny. Has
some stain in it to get into cracks and cover scuffs, but not quite the same.
Good source for stains though.
Waxing in Northumberland.
(see what I did there? )