Originally posted by NZ_Ross Very nice, looks like you had fun
I still need more practice, and need to work out what kind of images make the best cyanotypes.
As an aside, I was doing some research on the chemistry, as I understand there are issues to consider to ensure the long term stability of cyanotypes, and quite by chance came across a paper from 2018 in a reputable scientific journal investigating the anti-viral properties of one of the ingredients.
In the conclusion of the paper, the researchers stated that although generally non-toxic (indeed it's an approved food additive), the chemical in question could cause unpleasant side-effects when taken orally in high doses, so they helpfully suggested investigating suppositories as an alternative form of administration.
Obviously none of the conspiracy theorists or alternative remedy people have found that paper, otherwise I suspect I wouldn't have been able to get hold of the ingredients to make cyanotypes.
I'm quite happy for them to stick to dosing themselves with anti-malarials, and enough veterinary medication to worm a horse, since I'm not aware of any means to use these to create images.
The other ingredient contains the cyanide ion, which is actually quite safe in the context of cyanotype for the same reason it's toxic on it's own; it binds strongly to iron, which is present in the chemistry of cyanotype, but is also present in haemoglobin in blood. The cyanide can be released from the iron with certain strong chemicals though, so the optional practice of toning cyanotypes if done with too much of the wrong chemicals might earn an entry in the Darwin Awards.