Yes, QTR would allow you to use less color ink.
There was a test at Aardenburg-imaging that compared K3 ABW with QTR on Moab paper. At 100 MLux-hours of exposure (about 51 "Wilhelm" years of display), the ABW average delta-e was 1.4 compared to the QTR average 0.9 (lower is better). At Lab L = 52, the ABW delta-e was 2, for QTR it was 1.2. The most dramatic difference was that the ABW Lab B dropped 1.1 units, whereas the QTR Lab B was unchanged. The difference is almost certainly that the ABW's yellow ink component faded badly, whereas QTR probably had no yellow ink in it to start with.
The Lab A (at L = 52) dropped 0.3 for both samples. This is the tough one. It even drops with the silver prints. As a practical matter, holding it to 0.3 is very good.
Paul
On Mon, Jan 11, 2016 at 11:27 AM, exe.rpd@... [DigitalBlackandWhiteThePrint] <DigitalBlackandWhiteThePrint@yahoogroups.com> wrote:
Hi Paul,
If dedicated B 7 W ink sets are good, and Epson ABW are bad (Shorter life span), where does QTR fall in your opinion? Somewhere in between these two?