Proposal Type:

  • Micro

delete as appropriate


Cyanotype Chemicals - Potassium Ferricyanide and Ammonium Ferric Citrate

Submission Date:


Current Status:

Approved, ordered 2017-07-21


John Willis


The Cyanotype Skillshare was very well receivers and I would like to buy a small quantity of the two chemicals; Potassium Ferricyanide, and Ammonium Ferric Citrate (green ), for members to be able to carry out the process in Hackspace. The chemicals are not toxic and the process is safe if carried out with reasonable precautions.

Safety info from Wikipedia

Potassium Ferricyanide

Potassium ferricyanide has low toxicity, its main hazard being that it is a mild irritant to the eyes and skin. However, under very strongly acidic conditions, highly toxic hydrogen cyanide gas is evolved, according to the equation: 6 H+ + [Fe(CN)6]3− → 6 HCN + Fe3+[10] The reaction with hydrochloric acid is as follows: 6 HCl + K3[Fe(CN)6] → 6 HCN + FeCl3 + 3 KCl

Ammonum Ferric Citrate



Supplier Wetplate Supplies

100g Potassium Ferricyanide £ 5.49 250g Ammonium Ferric Citrate £19.99 Delivery £ 4.50

Funding source/model:

  • full funded by Hackspace

Resources depended upon:




Micro proposal

  1. Tom G
  2. Jonathan Taphouse


  1. Nick G
  2. Ian A-S

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  • botlab/hsproposals/hsproposals_2017-07-07-cyanotype-chemicals
  • Last modified: 22 months ago
  • by felix.h