Re: cyanotype toning and staining
I haven't toned cyanotype for quite a while, but I dare say the principles remain the same. Toning with tea is general, that is, the paper base and the image will be toned by the tea about equally. You can probably rinse some out, but the lightening won't as a rule be image-wise.
However, if you tone with a particular chemical, in this case tannic acid is mentioned, if you follow correct procedure rather than just overall soak, that is bleach first (which bleaches the image) with an alkali then rinse, and then "tone" with the tannic acid, the toning should be image-wise, replacing the blue image bleached out by the alkali. Then the tone, if it *has* stained the paper base, will wash out where there's no image quite quickly, leaving just the toned *image*, which is quite permanent.
There are also many possibilities for back & forth, or split toning, which can render shades from purple to black,
I cover that in Post-Factory #5 -- don't have one on tap now, tho if some generous person has it could look it up & reveal.
But the moral of this story, if I may be permitted the school marm tone, or even if not -- is you do yourself no favor to follow something you heard wherever by guess and by golly, then "ask the list." There are MANY sources of more or less complete information (tho in this issue, I dare say none to that date anyway complete as P-F --- the Keepers of Light section on cyano toning was off the wall). So if you count your time & materials as worth anything, it pays in the short run as well as the long when something is this well known to start there, and skip the "something like whatever" which can come later, after you've got the feel of it... then is the time to experiment.
On Wed, 6 Jun 2007, Matti Koskinen wrote: