On re-reading this thread I realize I've committed a sin which really p*sses me off when others do it: I didn't read the opening post carefully enough. I haven't toned the RC paper, I was referring to the Fineprint VC, a fibre paper. If I could remember John Clease's apology in "A Fish Called Wanda" I would recite it.
Alternatively, I could try a variation of what a friend of mine did years ago when he got so drunk at a party he couldn't remember it. A week later the attendees at the party received a card from him which said, "If I've done anything I should be sorry for, I'm willing to be forgiven".
I haven't noticed any brown hues with the Fineprint, just lovely deeper blacks with a slight plummy tone - but that's not the paper you asked about. I have a bottle of KRST, but haven't cracked it yet.
Anyway, my humble abject apologies!