There are techniques of controlling exposure such as Zone System and development, neutral filters etc etc...Let's say that I have to take a photo using B & W film and I have no choice to wait for better light and there is an area in the scene that has blown-out high lights which I can see it on the ground glass. I wonder if there is a technique using a filter such as UV or Skylight and smear on the part of the filter that corespond to the blown out on the scene using a subtance similar to pencil lead or something else... The idea is block out part of the scene which reqquires less alteration in the film development process. Anybodyknow about this technique (if it exists) and what subtance was used for it...? I search around the Net can't find the answer....
thanks...
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