In article , Wolf K
wrote:

Presumably if it was a monochrome photo, the printer would reproduce it
even if it did use colour ink.

Yes, but it will have a colour cast. Even when setting properties to
grey-scale there may be a colour cast, because the paper also affects
the final result. IME, the colour cast may take a day or two to appear.

either you're using incredibly bad inks or you're doing something else
wrong.

I'm using same brand ink as printer. A variety of papers.

it shouldn't be changing at all. that is *not* the norm.