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Laboldtech is the site n. 1 web site in Italy for selection, supply and sale of chemical reagents and professional tools specific for ancient photographic techniques.

Labotech2000 srl | Cusago (MI) Italy
📞+39.02 9039 4213

New cyanotype printing Single solution



Mike Ware Cyanotype

Single solution


This formula, arranged by chemist Mike Ware, works with the same chemicals of the classic cyanotype, only in this case they are combined to make a single solution, stable over time, that you use to sensitize paper. The variation is the substitution of ferric ammonium citrate with ferric ammonium oxalate.

The process is a little more complex than the standard cyanotype, therefore we chose to offer 100 ml bottle of ready made sensitizer in the kit-section of this website. 

If you wish to make it yourself, here is the procedure (the chemical products you will need are available in this website in the reagents-section)

Chemicals you will need:

sol. A 10gr ferricyanide potassium crystals

dissolve the ferricyanide potassium in 20ml purified water at 43°C

sol. B 30gr ferric ammonium oxalate crystals

dissolve ferric ammonium oxalate in 30ml purified water at 43°C

add 100mg of ammonium dichromate to solution B e dissolve accurately.

Add solution A to solution B, mix well and let it cool down at room temperature. 

You will see a residual of green potassium ferric oxalate crystals that you need to filter and remove. Caution: potassium ferric oxalate is an extremely toxic product so you must dispose of it according to the local law.

You will have about 60ml of an olive green/yellowish solution, and after you water it down to make a total 100ml you will need to filter it one last time  and finally store it in dark bottle. You can use this sensitizing solution for up to 1 year.


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