The standard formula for cyanotype is:
Solution A:
Water 100 cc
Ferric Ammonium Citrate 20 gm.
Solution B:
Water 100 cc
Potassium Ferricyanide 8 gm.
Before use, combine equal parts of A and B.
I use a better formula which I believe gives whiter whites and no
bleeding. It follows:
Solution A:
Ferric Ammonium Citrate 68 gm.
Oxalic Acid 1.3 gm.
Water to make 250 cc.
Solution B:
Potassium Ferricyanide 23 gm.
Oxalic Acid 1.3 gm
Ammonium Dichromate 0.5 gm.
Water to make 250 cc.
Mix equal parts of A and B just before use.
I can't help you with toning. I have never been able to get a toner
to work that would give a black and white image with cyanotype.
Hope this helps.
Bon chance and amusez-vous,
Bob Schramm