‘‘Glass slide covered in black ink or paint into which patterns have been scratched https://www.tate.org.uk/art/archive/items/tga-9222-4-8-82/agar-glass-slide-covered-in-black-ink-or-paint-into-which-patterns-have-been-scratched
Labelled 9L
plate negatives Glass slide covered in black ink or paint into which patterns have