But even serious magazines get it wrong…
In the current edition of the German magazine fine art printer (why don't they use a German title anyway?) is are two Cyanotypes of Allan Jenkins shown. While I'm glad that Cyanotypes get some attention, I don't like basic mistakes.
I don't know where they got from, that it is Turnball's blue (which is unstable) formin Cyanotypes, but as Mike Ware writes in his great book “Cyanotype”:
Because negative-working cyanotype are usually formed by the reaction of a ferrous salt […] with a ferricyanide, a common error in many older published accounts of the cyanotype process is to describe the pigment as ‘Turnbull's blue’ as ferrous ferricyanide. Modern chemical research has conclusively shown this to be wrong. When formed, ferrous ferricyanide rearrannges ‘instantly’ […] to give ferrocyanide, Prussian blue […] However, the early experimentalists may be forgiving[…]
This book is of 1999 and I don't remember reading other articles (on the net or in other books) claiming, Cyanotypes would be formed of Turnball's blue.
And FYI: it's Berliner Blau (Berlin blue) in German…
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