Digital BW, The Print

Thanks, Paul, for that information.
-John

--- Paul Roark <paul.roark@...> wrote:

> >... Hahnemuehle Photo Rag 308.
> 
> >QTR ink separation page printed at 100%.
> >Eye One spectro.
> >100% densities read:
> 
> >Eboni 1.71
> >FSN-C 1.24 Lab a=-0.5 b=-0.2
> >FSN-M .53 Lab a=0.3 b=-6.7
> >FSN-Y .36 Lab a=0.2 b=-4.4
> >FS-C 1.31
> >FS-M .49
> >FS-Y .36
> 
> >I've used FSN and FS on this machine before with no
> >problem. What seems wrong is:
> 
> >The FSN-M and Y seem too blue (note high negative b
> >numbers) while the FSN-C is close to neutral.
> 
> >The dark grays for both FSN and FS should be darker
> >(density around 1.5?). Also for both FSN and FS it
> >seems there should be more of a density difference
> >between the light grays and middle grays (M and Y).
> 
> The blueness is probably the same issue that is
> plaguing the 3D inkset.  I
> just received a new beta batch today for testing.
> 
> The main problem I found is that the LK from the
> supplier is too light.  MIS
> has been relying on the supplier for a standard LK. 
> The light inks are the
> most affected because they use only the LK as the
> carbon input.  The C and M
> are affected to a lesser extent because they also
> use PK.  To get the
> too-light LK up to snuff, PK has to be added to it. 
> Needless to say, doing
> this for every batch is time consuming.  I don't
> know how far back the
> problem goes. It's possible I'll be able to come up
> with a correction
> procedure for existing inks, but no guarantees
> there.  I'm not sure they
> have the information to know how far off the various
> back batches were. 
> 
> The closeness of the M and Y harks back to the Piezo
> days.  All inksets I've
> been involved with since the UT2 have corrected
> this.
> 
> If the FS-C has too low a Lab A for you, use the
> R2-N C or M (the same ink).
> That is what I now use in my 7500 instead of the
> FSN-C.
> 
> MIS is in the middle on this one.  The too-light LK
> is from the supplier.
> MIS is now going to have to QC every input and take
> corrective steps.  I'm
> not sure how they can to that and not raise prices,
> but they say they will
> try.
> 
> Paul
> www.PaulRoark.com 
> 
> 
> 


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