sensitiser
New cyanotype (Mike Ware)
Handle chemistry safely
Wear gloves and eye protection, work with good ventilation, and read the supplier’s safety data sheet before use. Hazard information here is a summary, not a replacement for it. Dispose of all photographic chemistry correctly, in line with local laws and your local authority’s guidance. Never mix waste solutions, and check the supplier’s safety data sheet before disposing of anything.
Ingredients
| Potassium ferricyanide | 10 g |
| Ammonium iron(III) oxalate trihydrate | 30 g |
| Ammonium dichromate | 0.1 g |
| Water to make | 100 mL (distilled) |
Notes
Make two hot solutions and combine them, then cool so that potassium ferrioxalate crystallises out. Filter off the crystals and dilute the liquid to volume. The result is a single sensitiser that keeps well. It contains a small amount of ammonium dichromate (an Annex XIV substance).
Source
The New Cyanotype Process, Mike Ware
Amounts as published. Chemical forms (anhydrous, monohydrate and so on) change the weights, so match the form listed.