What is the difference between the Iron Blue toners, and cyanotypes? I do a lot of blue toning but no cyanotypes.
In both cases the image is formed from the dye Prussian Blue. With the toner the silver image is replaced by the dye. The cyanotype process depends on the fact that certain iron salts are sensitive to light. The paper is sensitized with a mixture of ferric ammonium citrate and potassium ferricyanide. Then it is exposed to light and developed with water to remove any unused sensitizer.
Last edited by Gerald C Koch; 02-03-2014 at 02:20 PM. Click to view previous post history.
A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.