Has anyone ever tried to use Rosco or Lee filters, outside the yellow/magenta range, in an enlargement? If so, to what effect?
I know that paper is blue-sensitive, naturally, and is made sensitive, through the use of dyes, to green, in different amounts on different layers. That is why the Yellow #00 gives us low contrast, because it blocks the blue light, allowing only the low contrast green dyes to work full time. Similarly, the magenta filters block different amounts of green light, letting only the blue through and, thus, increasing contrast.
My guess is that a blue filter would cause a high-contrast image, but with wicked fast exposure times, and a green filter would give a low contrast fast exposure.
What about other colors, either in the filter drawer or as a filter over a mag-lite, for flashing all or a portion of the paper? Anyone tried this?
Bayard
I know that paper is blue-sensitive, naturally, and is made sensitive, through the use of dyes, to green, in different amounts on different layers. That is why the Yellow #00 gives us low contrast, because it blocks the blue light, allowing only the low contrast green dyes to work full time. Similarly, the magenta filters block different amounts of green light, letting only the blue through and, thus, increasing contrast.
My guess is that a blue filter would cause a high-contrast image, but with wicked fast exposure times, and a green filter would give a low contrast fast exposure.
What about other colors, either in the filter drawer or as a filter over a mag-lite, for flashing all or a portion of the paper? Anyone tried this?
Bayard