Iron blue toner by the teaspoon

[psvensson]

psvensson submitted a new resource:

(there was a url link here which no longer exists) - Iron blue toner by the teaspoon

A slight variation on Kodak T-12 Iron Blue Toner, with some usage notes for acheiving bright, saturated cyanotype tones. It's easy to mix up on the spot. In fact, I don't think it will keep once the ferricyanide has been mixed in, so this is a one-shot.

500 ml water
1/2 teaspoon ferric ammonium oxalate (ferric ammonium citrate works too)
1/2 teaspoon sodium bisulfate (or some other acid - oxalic, tartaric and citric probably work too)
1/4 teaspoon potassium ferricyanide

Bathe prints...

(there was a url link here which no longer exists)

 

[holmburgers]

Any examples?? Sounds useful indeed...