Cyanotype is not the "precursor to the modern blueprint" process, it is the modern blueprint, unchanged. Dr. Mike Ware created a modified version of cyanotype, called 'New Cyanotype', but as it uses highly toxic chromates, it is not preferred for industrial use. One of the benefits of cyanotype is that it is so harmless, unless, of course, if you heat the undeveloped, dried chemistry, in which case cyanide gas is released.
John Herschel is said to have studied at Eton. Actually, he was only there shortly, leaving after a few months after being bullied. —Preceding unsigned comment added by 188.8.131.52 (talk) 10:14, 15 August 2008 (UTC)
I uploaded three new photos of John Herschel by Julia Margaret Cameron, below, including one that's a full version of the current lead image. Feel free to use if useful. Dcoetzee 18:07, 14 October 2009 (UTC)
Herschel is an extremely common German Jewish name. Is it possible he had Jewish ancestry? It is not an impossible assumption, but is it unlikely? 184.108.40.206 (talk) 23:06, 8 March 2010 (UTC) See the article on William, which implies that John Herschel was one quarter. —Preceding unsigned comment added by 220.127.116.11 (talk) 13:47, 24 March 2010 (UTC)
Hundreds of millions of Christians have Jewish ancestry. Is that somehow significant or important? According to Jewish law, it's important only if his mother was Jewish, Otherwise it's just minor fluff and doesn't belong in the article. Santamoly (talk) 06:48, 13 August 2012 (UTC)