Indeed. Here's another .........
For bluetoning a silver print, cyanotype printers can use their A & B
solution to make a good toner very easily.
Mix 10 cc of solution A (the ferric ammonium citrate) and 10 cc solution
B (the potassium ferricyanide) in 20 ounces of water.(You don't like
mixing measures? Use 600 cc water, more or less, formula is very flexible.)
Stir.
Add 70 cc of 28% acetic acid.
Soak your silver print in water til it softens, rock gently in the toning
bath til you like the color. A fully toned print can be modified in 1
tsp borax/liter water (20-mule team OK), which turns the blue brown.
Dashing into rinse water at right moment gives split tones -- beige
highlights, blue shadows. Wash 5 min.
Toner goes off quickly. Use a small amount at a time.
Judy