Fade-resistant bulk ink options for XP15000 (what combination)

[wpinkus]

Epson is adding ink colors on several printer models - mainly on the larger format units, like orange, red, green blue violet, which you all can mix up with the prime CMY colors. I did that on the P400 longer time ago. There was a small, pretty small gain of the gamut size with the OEM inks vs. those mixed inks, but that small gain was too small for me to stay with separate inks for these secondary colors. I did 1 part yellow and 2 parts magenta for the red tone and 2 parts yellow and 1 part magenta for the red. I did this with pigment inks so there was less concern about fading.
And it's not just the assumed gamut gain - your images you are going to print need to have colors in that specific spectral range in the first place - outside the gamut with the mixed colors, but still inside the gamut with genuine inks to see any difference in print at all.,

Thank you. I see, from your and others' comments back in April 2022, that the choice for a bottled Red was Canon GI-53 Red. I'll keep that in mind.
I'm just gearing up to take my XP-15000 tankless after being shocked at the ink losses from multiple restarts as random cartridges ran out and had to be replaced individually. Red, in particular, was seeing more ink use for restart dumps than for actual printing.