Re: Uranotypes



            Thanks for the info!  It will take some machinations to get the uranyl acetate where I live but I would like to try it.

            Does the uranyl acetate fluoresce any more than uranyl nitrate?   

            The uranochrysotype sounds interesting...any idea of the image color?  Do you have a sample to scan and share?  One of the reasons I love uranotypes is the amazing "old burgundy" color, reminiscent of the color story of Caravaggio's paintings! 




From: [] On Behalf Of Mike Ware
Sent: Sunday, May 30, 2021 11:17 AM
Subject: Re: [altphotolist] Uranotypes


Bob -
Uranyl acetate is said to be ~10% w/v solubility at room temperature. Aim for this, at least, or even 15% if you're warm! Say 7 g in 50 ml. water. 
(A drop or two of acetic acid may help, if it tends to deposit solid basic salt due to hydrolysis.)

You can expect a bright green fluorescence when you put it under the UV! Exposures will be lengthy.
I don't know if you can mix it with your ferricyanide solution, before coating, without it reacting  - it's worth a try. Otherwise develop your Uranotype in ferricyanide as usual.

P.S. If you have any sodium tetrachloroaurate dihydrate, NaAuCl4.2H2O, dissolve 1 g in 10 ml. Mix this solution 1:1 with your uranyl acetate solution to make a nice gold print - uranochrysotype!
Mike Ware

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