@stratman - I can wholeheartedly support your enthusiasm that the search for the 'best' refill ink is effectively over with the availability of the Epson 106 and Canon Chromalife GI-53 bottled inks for Canon and Epson users. I have tested a range of inks over the years,
@maximilian59 has tested a selection of inks as well, Wilhelm/WIR did, Aardenburg did, but there are a myriad of more refill ink sellers on the market - local or global - via Internet - InkTec, Octopus, China sourced and all those. If there is a seller with a 'better' performing ink he can show a test supporting that claim.
And there are some restrictions and caveats nevertheless
- not all ink colors are covered by the listed inks - no light inks, no gray or red or blue or green which are used in some printer models. Some of those colors can easily be mixed from the base colors, and a dilutant/solvent/clear ink is available by Octopus for Epson inks. Some interested Canon user may have a look into the safety data sheet and look up the solvent ingredients for a Canon ink base - some mix of water and glycoles.
- The listed inks above may not be available in all parts of the world, driven by the market segregation by Canon, Epson, HP or inks may have a different number in some areas.
- It is important to understand that the fading performance of an ink very much depends on the paper which is used for the print - pricing of inkjet/photo papers varies in a wide range. I'm basically finished with ink testing at this time, I'll start a test with a collection of some papers including some FineArt/Baryta types soon.
- Informed users have a choice for inks and papers for their own criteria of pricing and performance, not all prints need to have archival quality and just may be passed around on the next party and then be forgotten, so there is nothing wrong to look for budget level consumables in particular cases.
- All this applies to dye inks, the situation with pigment inks is not easier, pigment inks generally last longer, but as well with a high interdependence of the inks with the paper and the generation of the pigment inks - like Ultrachrome K3, HD, HDX etc or Lucia, Lucia Pro. There is a wide range of test reports published with pigment inks by Aardenburg and WIR for OEM inks, tests of 3rd party pigment inks are very rare. And inks of a supplier may not be as great as he is claiming - as I have shown for the black level of the super matte black by ConeColor.
https://www.printerknowledge.com/threads/matte-inks-for-epson-printers.14396/#post-124829
Other inks can easily compete.