Ortho is sensitive to blue and green light, but not to red.(posted 8768 days ago)Most panchromatic films are less sensitive to green light than the eye, and my hope is to get foliage that is rendered about as the eye sees it, instead of dead, dark, grays.
Also, I'm interested in tray development of 8x10's with a safelight.
For portraits, ortho supposedly adds "character" to mens' skin. The pink and red coloration goes dark.