On Jul 18, 7:22*pm, Smitty Two wrote:
In article ,
*"Ed Pawlowski" wrote:

"harry" wrote

You will not get black. *That's why there's a separate black cartridge.

It was not always like that. *Check out an HP500C printer that had only one
cartridge. *It was not a true black, but "close enough" for most people.

It's the difference between theory and practice. Nevertheless, the OP is
trying to forge black from what he has available. Equal proportions are
his best/only option and he gets what he gets.

No-one has been able to come up with the absolutely true RYB colour
pigments. That's why when you mix them you will only ever be able to
get a mucky brown at best. Nowhere near black.
It all stems from the subtractive and additive colour combinations.
Also what pigments can be manufactured.