Hi Terry. The info Dave shared seems to suggest that you acidify the water for development. I’ve never tested the acidity of our water, but I know that it is not ‘hard’ as found in some areas. Results with cyanotypes have been variable, so I think it’s worth trying.
I can tell you that bathing the washed print in a mild solution of Hydrogen Peroxide produces a very dramatic intensification of the blue image. You can buy bottles of it quite cheaply in hairdressing suppliers, and probably also Boots, etc. Mine is a 9% solution, but I diluted it further for use.
Alex
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