storing A and B cyanotype solutions
Darlington Media Group (postmaster@mediaworkshop.demon.co.uk)
Sat, 20 Jun 1998 20:21:46 +0000
My preference is for brown glass bottles. Glass is more inert than plastic,
in fact some plastics "breathe" leading to oxidation of their contents.
However, your major problem will be with the ferric ammonium citrate. Even
when I have taken great pains to sterilise the bottles and used distilled
water etc. I have found wonderful growths of mould floating on top of the
solution after only a few weeks. It would be advisable to add a few drops
of a preservative to the f.a.c. prior to storage. You could use thymol,
formaldehyde but I am sure others could come up with more and better
suggestions.
Your best bet would be to make up only what you need for a couple of days
and keep the dry compounds in their respective storage jars until needed.
Tony McLean.