Colour negatives are printed on RA-4 papers and produce a Type C print.

Black-and-white prints were used for practice by BBC film editors, in deciding where to make cuts, before cutting the master colour negatives.

Today's processes are called RA-4, which is for printing colour negatives, and Ilfochrome, for colour transparencies.

Panalure was developed to facilitate the printing of full-tone black-and-white images from colour negatives - a difficult task with conventional orthochromatic papers due to the orange tint of the film base.

In the case of Light Boxes the artist took colour shots of herself, and from the colour negatives she inserted her figure into old black-and-white negatives depicting her as a child.