11. A "'sensitivity speck "'is a place in silver halide crystal where latent image is preferentially formed. 12. The latent image is subjected to photographic processing, which makes it visible and insensitive to light. 13. The sensitivity type largely reflects the site of very shallow electron traps that form latent images effectively. 14. The latent image can now be classified. 15. Another important way to increase photographic sensitivity is to reduce the threshold size of developable latent images . 16. Further generation of photoelectrons is necessary to grow this small speck to a larger, stable, latent image . 17. This " latent image " is then " developed " for example by rinsing with an appropriate solvent. 18. Depending on the silver halide crystal, the latent image may be formed inside or outside of the crystal. 19. LIRF is due to inefficiency of forming a latent image , and this reduces photographic speed but increases contrast. 20. However, in order to act as an effective latent image center, at least four silver atoms are necessary.
