There were some posts around March 26, 2001 on this subject on D1scussion. Juergen posted a couple examples (different subjects) that did in fact look very yellow, and pointed out that the eyes were acceptably white. The photos aren't there any longer but the posts are still available in the forum archive.
There was a follow up post suggesting this might be a UV Flourescence problem (the kind that makes certain bridal dresses glow blue or white undergarments flouresce beneath clothing, and a suggestion to try a " KR1.5 (not an 81A, unless that's
all you can get)." But nothing definitive came out of it that I could find.
You can find the threads if you are registered with D1scussion by searching on "teeth." Good luck with this.
http://nooper.com/lists/lyris.pl?enter=d1scussion