Digital BW, The Print

Paul,

I read your post with the fade figures and had a few questions on 
interpretation.

You gave hour figures and though there was a difference between the 
two ink sets, the *absolute* amount of fading was quite minimal on 
the K3, or so it seemed to me.  So I'm wondering what you think the 
significance of this is over real time.  

Also your figures were for unglazed prints (I gather) and I'm 
wondering about the effect of glazing on both the absolute and the 
relative figures.  I notice in Wihelm figures that glazing provides a 
protection factor varying from about 1.4 to 1.8, which is a big 
difference between paper/ink combinations.

Finally I wonder about the assumption of linearity--that early 
results will be linearly extended over time.  I expect these are 
curves.

I think you also mentioned that any "toning" with the Epson controls 
increases the use of color inks, but I'm not sure this is true, at 
least for certain colors.  In using an ABW setting of -12 -16 for the 
USFA (which gives a pretty neutral gray), the usage of yellow in the 
4800 has dropped to about that of the cyan and magenta, which is say 
it is used mostly for cleaning cycles.  The light magenta and light 
cyan levels seem about what they are without tone adjustment.

Thanks,
Walt