The Cyanotype Recipe I use:
65 g ferric ammonium citrate in distilled water to make 250ml total.
23 g potassium ferricyanide in distilled water to make 250ml total.
Store solutions separately in brown glass bottles, away from light.
Filter before use, and mix in equal proportions A to B
After coating dry papers in the dark or in very subdued light. Expose until the colour changes to a dark prussian blue (this will vary dependent on the strength of your light source).
Rinse in tap water, or for a boost give your print a white vinegar rinse then finish rinsing in tap water. The colours will continue to deepen over the next 24 hours.