Quote Originally Posted by Dave Starr
I wonder about the color balance of your negatives: What was the color temperature of the light used for their exposure (approximately), and what was the "balance" of the negative film?
The film was Kodak Ultra Color 400, 120 size. The shots are yellow daffodils with a black background, shot outdoors, mixed clouds & sun. Background was black mat board.
What's got me wondering is, the flowers look pretty good. The 2 lightest gray squares of the Color Checker have the cyan cast. The white square looks fine & so do the other colors. Could UV light cause this? I know I've gotten a cast similar to this with a non-UV filtered Novatron strobe set-up and the brighteners in white paint (woodwork), but I'm not sure the Color Checker would do this as well.
Ah!! Yes, you could be running into UV fluorescence! - which will give you a cyan cast.

I participated in a "turkey shoot" a while back (briefly!) where they were using Novatrons ... and they obviously were *not* UV corrected ... The colors were definitely cyan - casted and "out of whack". Difficult to print! I finally gave up on those. At that time, I used my Hasselblad "ProFlash" (Metz CT4) for a few exposures, and the colors were superb!
I *love* my UV corrected DynaLites ( all Dynas are UV corrected).

I've been searching for a *good* gray card ... In this search, I found a review of "cards", including the MacBeth Color Checker and it was reported that *some* of the panels were adversely affected (fluoresced) with UV- content lighting.