RE: Cyanotype chemicals need cooking?
Probably they were referring to the making of New Cyanotype solution - as noted by Doug... For both New Cyanotype and Classic Cyanotype I mix the solutions away from (UV rich) daylight, under a fairly strong (100W) incandescent light source. I even mixed the solutions under - again, fairly strong (23W) - spiral fluorescent light bulb and never experienced any adverse effects. To prepare New Cyanotype sensitizer: I simply boil water, let it cool to around 60-70C / 140-160F (nothing precise; I just wait until I'm out of patience - which usually takes a fairly short time) and then prepare and mix the solutions in above stated lighting conditions. No problems at all... I think it's overkill (and dangerous - especially with hot solutions) to work in dark (or excessively darkened) environment for mixing the solutions. Regards, Loris. 8 Temmuz 2008, Salı, 10:04 am tarihinde, C.Breukel@lumc.nl yazmış: > To only reason I can think of, in case of the classic Cyanotype recipe , > to boil it, is to sterilise the solution. Bugs like to feed on the > Amonnium Ferric Citrate. Not sure if boiling is harmless to both chemicals > though, > > Best, > > Cor > > > ________________________________________ > From: dhowk [mailto:dhowk@comcast.net] > Sent: dinsdag 8 juli 2008 1:38 > To: alt-photo-process-l@usask.ca > Subject: Re: Cyanotype chemicals need cooking? > > I would suspect they purchased the Mike Ware version from PF. Initial > steps include keeping solution at 120 degrees F. > Cheers, Doug > > > On Jul 7, 2008, at 6:38 PM, Linda Stinchfield wrote: > > Hi, > > A couple of weeks ago I did a one-day cyanotype workshop for members of my > book arts group. They were very enthusiastic, and one friend in particular > was keen to try more. I recommended getting the chemicals at Keeble & > Shucatt, a local store that carries kits from Photographer's Formulary. > But she lives over in the East Bay and she ended up getting them somewhere > in Berkeley. When I asked how it went, she replied, "David and I cooked up > the brew (we had to buy chemicals and cook them in the dark on the stove). > It was the only solution I could find in Berkeley. Anyway.... The mid > tones are great, the blue is soft and the process was easy." > > Her reference to cooking the chemicals really baffled me. I've never > cooked them, and have never seen anything in the literature about it-- but > I admit I'm somewhat new to this myself. Is this something that is > rendered un-necessary by using the Photographer's Formulary kits? > > Thanks, > Linda
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