Digital BW, The Print

Walt,

 

I have not used or tested the latest Cone inks, specifically the K7, to see
if they have the same tone-shifting characteristics when left idle in large
format printers.  I think it likely that all blended inks will have the same
issues, in part because the pigments are virtually always going to have
different specific gravities and other characteristics.  

 

One interesting possibility that has been suggested to me is that part of
what happens in large format lines has to do with the interactions between
the pigments and the tubing material.  If this has something to do with the
electronic attractions between the chemicals or the "edge effects" of the
pigment particles, it raises the question of whether coated pigments might
behave differently.  I have also not tested this.  (Note, the "edge effects"
of carbon and other pigments are where much of the action is.  Pigment
companies compete in terms of how they deal with this.  See, for example,
this piece that is used by one such company to promote its pigments:
http://home1.gte.net/res09aij/Pigment_Edges.jpg  The pigments I've used in
blends where the tone changes have been noted are believed to be from the
same company and have similar edge treatments.)

 

As a practical matter, when it comes to these large format issues it is
simply too time consuming and expensive for me to test all of the options.
So, if a non-blended approach works OK for me - and at this point it looks
like it will - then it is not practical for me to test all possible
alternatives. 

 

Paul

www.PaulRoark.com <http://www.paulroark.com/>  

 

 

  _____  

From: DigitalBlackandWhiteThePrint@yahoogroups.com
[mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of Walt
Odets
Sent: Sunday, October 15, 2006 11:36 AM
To: DigitalBlackandWhiteThePrint@yahoogroups.com
Subject: [Digital BW] Re: UT-3D Dark Magenta ... Green???

 

Paul-

I'm assuming that this concern with the settling of blended inks would apply
to sets like the Cone K7?

Thanks,
Walt

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