Digital BW, The Print

I ran a centrifuge test on few alternative bases for diluting the HP 
PK.  I included the un-altered HP Grey in the test for a control or 
standard against which to measure the results.  The most surprising 
result of the test is that the HP Grey settled significantly more 
than my dilutions of the PK.  (24 times the change of the buffered 
new base I'm working on.)  This probably because HP has to stay with 
a lower viscosity ink for the thermal heads.  It suggests to me that 
Epson may still have a bit of an advantage on this front.

(Does the HP Z3200 have a way to agitate its carts continuously?)

Other results of interest were that the buffered base was more stable 
than an otherwise identical un-buffered version of the base, 
consistent with the dogma that electrostatic stabilization is pH 
sensitive.  

On the other hand, the sample diluted with the old, un-buffered 
Carbon-6 base was also very stable, perhaps due to it's slightly 
higher viscosity and specific gravity.  It had a higher glycerol 
content that any of the other samples.  

Paul
www.PaulRoark.com