VC paper is sensitive to blue and green light. Blue gives high contrast. Green gives low contrast. To get the highest contrast, expose the paper to blue light only. So:
Originally Posted by cliveh
1) If you have a narrow blue light source (that has no green in it), the answer is to use blue light.
2) If you are filtering white light with filters, magenta is the answer, because magenta filters out the green and allows blue light to pass.
This is the simplest way to think about it. In reality paper sensitivities are not "sharp cutting" so there are subtelties. But not anything to really worry about.
Let me know if this makes sense or if it is still confusing.
Last edited by Michael R 1974; 03-01-2013 at 08:58 AM. Click to view previous post history.