Assuming Lesbonnes is correct, and that .02 ml or even .03 ml are process waste that does not appear on the print, we are left with the following usage from my original report comparing an B&W print made using standard RGB workflow as opposed to ABW workflow on an Epson SC P-9000:
Epson RGB: CY: .07 LCY: .09 PB: .20 VM: .06 LB: .54 G: .06 LLB: .38 VLM: .14
Epson ABW: LCY: .18 PB: .32 LB: .25 LLB: .21 VLM: .24
The total amount of coloured ink used by each process is exactly the same: 0.42 ml. The RGB process uses C and LC, M and LM and also uses a little bit of green. The ABW process uses only LC and LM. But the RGB process uses much more black ink in total: 1.12 ml versus 0.78 for ABW. Does this have implications for longevity of the print?
Wilhelm is not the most authoritative researcher of longevity as we have seen from comparative results published by Aardenburg, but neither have tested longevity of B&W prints produced in an RGB workflow on an Epson printer. The comparative ink loads could indicate an RGB workflow produced B&W print may resist fading or colour shift for longer, a suggestion that should be tested.
David Kaufman
www.davidkaufmanphotography.com