That’s a sheet of typing paper isolating the black plate which is on top, just like when printed. Until the world of “K Tones” came along, which are different values of the color “black” –only photographs had them. This could muddy up the cover which is one of the reasons a 3M was asked for.
That’s a sheet of typing paper isolating the black plate which is on top, just like when printed. Until the world of “K Tones” came along, which are different values of the color “black” –only photographs had them. This could muddy up the cover which is one of the reasons a 3M was asked for.