Digital BW, The Print

I don't know if Nick is still active on this list but here goes.

I have similar reasoning and methods for inkjet coating and have 
incorporated some of the techniques he mentioned on this list last 
august. One of those was spraying a coat of Print Shield on the print 
before coating with Liquitex acrylic varnish.

However, I am beginning to think that the combination of Print Shield 
and this varnish causes yellowing. At this point I am far from 
convinced that this is true, but I think I have eliminated other 
variables and the only similiarity I can seem to find in some images I 
have printed that have yellowed after only a few months is this 
combination.

I have a couple of prints that seem to have warmed up since 
October/November stored in a stack of archival prints in my office.  A 
client called me the other day to say that their print (yet to be 
framed) had "turned yellow" I haven't seen it yet, but should get it 
next week.

Any experience or informed speculation would be appreciated.

FYI

Hanemuhele Photo Rag 308
Epson 7600
MIS UT7 inks
QTR - Mac
Premier art print shield
Liquitex Acrylic Medium and Varnish - Gloss
mixed with Distilled water and a small amount of Liquitex Acrylic 
Medium - Matte