Emulsion scratches have the same characteristics in that they are black in
prints but white in a print made from a negative. This can change depending on
the depth of the emulsion scratch. If the scratch is so deep that it removes the
emulsion in the negative, then they will appear black in the print or white if
the print itself is deeply scratched.
With colour films, emulsion scratches will change colour according to the depth
of the scratch because of the removal of one, two or three layers. The colour
changing with the number of layers removed.