Talk:Cyanotype

Wavelength sensitivity
The exact wavelength which the coating chemical is sensitive to should be determined and mentioned.
 * Done√ ”sensitive to a limited near ultraviolet and blue light spectrum, the range 300nm to 400nm known as UVA radiation” is in the head of the article.Jamesmcardle(talk) 03:20, 25 April 2022 (UTC)

Proposed merge of Cyanography with Cyanotype
The two articles are strongly similar, and cover a lot of the same ground. It seems reasonable to simply merge them together instead of keeping the rather unintuitive split that currently exists. Yitz (talk) 18:45, 2 August 2021 (UTC)
 * Agree. Merge under Cyanotype, a term used in John Herschel's 1842-3 On the Action of the Rays of the Solar Spectrum on Vegetable Colours. Cyanography however is a rare term, though used as far back as 1880s (try an Ngram – it doesn't come up). Cyanography — also rare — is more widely known as a medical test conducted "to evaluate children with potential respiratory compromise," so liable to confuse. Jamesmcardle(talk) 00:59, 20 January 2022 (UTC)
 * Cyanography is a different activity than cyanotype, it uses the same chemical ingredient, the cyanotype ink, but in other ways. The cyanographies are each unique, the emulsion is not homogenic on the support, it's offen painted with various dilution, concentration, and on different supports.
 * There is an article in french about "cyanographie" but i can't manage to do the link. The cyanographie is an emergent artistic activity
 * 45.155.230.251 (talk) 17:19, 25 January 2022 (UTC) User: ([[User talk:]) 18:18, 25 January 2022 (UTC)
 * I the proposed merge. Most of the sources in Cyanography don't use the term. The two articles have significant overlap, and cyanography is best understood in the context of cyanotype. The merged content would not make Cyanotype overlong. Per WP:MERGEREASON, there's support for merging as the best option here. Firefangledfeathers (talk | contribs) 15:38, 8 April 2022 (UTC)
 * Support merge. The problem is twofold; first, the application of the practice (or technology) might be different to the technology itself, but that fact is so hard to establish by the sources alone; and second, if the application were easily established as distinct of the technology, it would still make most sense at this point to keep the two together in one article. If the artistic activity is in fact emergent, then we shall no doubt see more and more sources available to us.
 * I will also add that anecdotally I have asked a couple of experts (practitioners and lecturers in chemical photography), and they haven’t heard of the word, nor do they believe the idea makes sense as a distinct concept. All of this may well be viewed differently in French photo culture, but I don’t think that’s truly evident in reading the French article. — HTGS (talk) 02:52, 11 April 2022 (UTC)

Cyan blue
The first paragraph describes the color of cyanotypes as "cyan blue." Colors described as "cyan blue" are usually closer to the green spectrum, with a hue angle around 180 degrees. However, the blues in these pictures are nowhere near cyan hues. In fact, the blue in the first cyanotype is #103c85 and has a hue angle of 217. — Preceding unsigned comment added by Mfrittman (talk • contribs) 20:56, 22 February 2024 (UTC)
 * Very good point. I've change the few such uses to just 'blue'. Firefangledfeathers (talk / contribs) 22:11, 22 February 2024 (UTC)