Originally Posted by jnanian
The "native" form starts out without any spectral sensitization.
Those are "unsensitized" or "blue sensitive" and may be sensitive mostly to
UV and some blue. (Ordinary B/W photographic papers, salt prints and siderotype processes belong here.)
If you sensitize for green the material becomes "orthrochromatic".
(MC/VC photographic papers fall into this category.)
If in addition you also sensitize for red,
the material can be called "panchromatic"
(There used to be a few panchromatic b/w papers
for printing b/w prints from color negs.
Total darkness was the best safelight.)
Last edited by Ray Rogers; 02-01-2011 at 11:11 AM. Click to view previous post history.