Liam Lawless (lawless@vignette.freeserve.co.uk)
Sun, 21 Feb 1999 02:33:16 +0000
Bob,
The problem seems to be physical - shoving the chemicals around the paper
before the image has fully formed. Tonight I've tried something different,
which seems to work.
Added an equal volume of 1% gold chloride to the ferric amm. citrate
solution and printed out for longer than before, then developed with 0.5%
gold chloride on a foam brush (as before). The image does not disintegrate.
Soft blue-grey tone, with much better density than before. Not bad at all.
Sensitiser might cost more with added gold, but look at it this way: your
f.a. citrate will go further!
Just washing the paper with water instead of developing still gives an
image, but v. pale and ghostly. Rather than develop with gold, you can
develop with ferricyanide solution (the other half of traditional cyanotype
sensitiser), which gives a good, strong blue image. Of course you can do
exactly the same thing without the gold in the iron solution, but with Au
gives much better image quality: a royal blue instead of green-blue colour,
better resolution and contrast, and stronger blacks.
Liam
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