Digital BW, The Print

Paul,

>>>>
No mistake.  The FS-K appears to do better in the 100% patch than in
midtones.  Although I must confess I was a bit surprised myself that
no warming at all occurred.  I've come to the conclusion that the FS-K
does have a bit of dye in it. ...
>>>>

Ah, this explains a lot of things. 

>>>>
Some could read the tests as indicating that the Matte Black is
tougher than the Archival Black.  Frankly, I suspect the very slightly
better performance of the Matte Black is an artifact of the testing. 
In better-controlled tests and the real world, I'd bet on the Archival
Black.  The fading and warming in these tests is not linear.  So, what
does best at first may not do better over the long haul.  Also, any
test that does not hold the humidity constant exaggerates
longevity.  
>>>>

Understood.

Thanks very much for the report.  This is really filling in a lot of
blanks and I'm sure other readers are following along.

Best Regards,
Clayton