A bit of a comparison here. The 4 seconds I spoke of the other night related to the availability of this type of light illuminating the subject. This was several minutes after sunrise as the sun had to reach an elevation of at least 5 degrees to cast rays of this wavelength on the buildings and silos.

Same negative, two different scanners.

This image has been processed to remove dust marks and scratches. This is more in keeping with my mind’s eye.

Original scan below with no dust or scratches removed. In fact most of the fine scratches are not even resolved by the scanner.