The split tone was intentional in that I intended to split tone, but the effects are sometimes unpredictable so you never quite know what you are going to end up with exactly. What I usually do is pick a pale shade of grey on the print and bleach in dilute ferricyanide until this tone disappears. Then it's a quick snatch into a tray of water and wash. I then tone in variable sepia until completion (varying the amount of additive to taste - this was 50ml/litre). This way at least I can replicate the effect on another print.