I've been printing up some 'found-in-the-attic' negs recently, both glass plates and 6x9 film and noticed how the resulting prints seem to 'glow' with tone. When I use a focus finder on modern films it's obvious how wafer thin emulsions have become, since the slightest movement on the enlarger controls will flick it in and out of focus compared to these old ones than seem to have been buttered on. Old emulsions are so thick you can decide if you'd like to focus on the top, middle of bottom of the emulsion. This physical depth must reproduce in the paper emulsion as well giving that 'glow'. Any thoughts?