Summary: When light sensitive material is exposed to light, a chemical change happens, but this change isn’t necessarily visible. This idea is perhaps part of why early photographers – and early viewers of photographic images – had a hard time with the concept of the latent image, yet it was one of the most important components of the technology of photography in its infancy.<br> <a href="http://photohistory.jeffcurto.com/wp-content/uploads/2015/05/dag6fix.jpg"></a><br>
