11. The expense of developing photo sensitive paper caused many seismic observatories to switch to ink or thermal-sensitive paper. 12. The expense of developing photo sensitive paper caused many seismic observatories to switch to ink or thermal-sensitive paper . 13. When they first appeared, fax machines could send and receive documents on heat-sensitive paper , but not much else. 14. Four different types of imaging chemicals are used in thermally sensitive papers : leuco dyes, developers, sensitizers and stabilizers. 15. The moving reflected light beam would strike the surface of the turning drum, which was covered with photo-sensitive paper . 16. It is now believed that the pair were recorvering sensitive papers relating to correspondence between Edward VIII and Adolf Hitler. 17. Not long ago, printing your own photographs required a darkroom packed with intimidating timers, light-sensitive papers and vats of chemicals. 18. Photography, at its simplest the capture of an image on light-sensitive paper , has depended upon responding to an external reality. 19. In addition, the chemically sensitive paper safeguards against attempts at chemical alteration by discoloring if exposed to solvents, the bank said. 20. In this series he started to work directly onto light-sensitive paper , capturing images of fish, seaweed, sediment and other organic matter.
