Quote Originally Posted by Athiril View Post
Some backing papers are black with white numbers though?
None that I have seen but I stand to be corrected. Ilford paper is white, Kodak is yellow and I think Fujifilm is white too. They are black on the rear i.e. the surface touching the non-emulsion side of the film.

When using a camera with a frame counting window, I have always seen a light coloured paper with dark coloured numbers (or in Ilford's case, slightly darker numbers!).

EDIT: Ilford's papers are white for the majority of their length. The last few inches are black which gives some distinction between exposed and un-exposed film when rolled up.