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Yes, Poly Vinyl Alcohol. I found the UN soln, even without the dichromate, VERY "fluid" so it soaked into the paper, even the COT 320. Those few drops slow down the soaking in so, though it DOES soak in a bit, it stays near enough the surface to be exposed. No idea about the PVA's specs. I asked a friend at a local lab and this is what she gave me.
It sounds like you are taking proper precautions!
From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Jim Patterson,
Sent: Sunday, May 30, 2021 10:06 AM
Subject: Re: [altphotolist] Uranotypes
Thanks for the info. I have potassium dichromate powder so I can make any strength. What is the PVA purpose. I assume that is polyvinyl alcohol solution. I have many types of powder including a commercial solution. Is it medium weight, partially hydrolyzed? And what %w/v?
I am an Occupational Medicine MD so I am aware of the risks. I added the calculated amount of distilled water to the bottle the UN came in rather than pour out the powder to weigh. It is stored in a brown glass bottle in a steel container.
I use nitrile gloves, rubber apron, respirator, and safety glasses. Darkroom has cross flow ventilation.
On May 30, 2021, at 8:41 AM, BOB KISS <bobkiss@...> wrote: