The abbreviation PVA is used for both poly vinyl alcohol and poly vinyl acetate. It’s doubtful that the acetate would make a wetting agent but the alcohol might be useful

Brittonie, I am using Photo-Flo as a surfactant for Hahnemühle Platinum Rag paper. I have also used Tween 20. Check the prices on the two. I don’t use it on Cot 320. I don’t think most papers

Red deft soap- what do you specifically use it for? Process etc? This is a psycho-material tour of people’s practices -- BrittonieFletcher.com

That example is great Chis -- BrittonieFletcher.com

Hi all thanks for the feedback so far! So this is for sure to help explain to students but also for my own sort of holistic look at stuff- Like photo flo helps dry film cleaner as a wetting agent

I use dreft soap, it is perfect Envoyé depuis mon appareil Galaxy

Brittonie, I got a good recent visual for you. Chrysotype with no Tween (left) and Tween 5% 2 drops per 1 ml sensitizing solution, right. Layman’s terms: I explain it to students that it breaks

You also have Kodak's Photoflo 200 Then you can also get Winsor-Newton's Ox Gall Wetting Agent. Greetings & Kind Regards! Cedric Muscat

Hi Brittonie The only two I use are Tween 20, which is a non-ionic detergent, and glycerol (aka glycerine) which is a humectant or wetting agent. I use each at c. 0.3% v/v. Each paper has to tested

Hi, I probably should be digging through books before asking, but, I’m trying to get layman’s terms for surfactants functions in alt pro… And a list of them. Thanks in advance for any

In US sodium Chlorate is available as a herbicide and others sources. 12% (40 volume) H2O2 is available at Beauty Supply shops, and 27% H2O2 is available at Swimming Pool supply stores.

Good to know...but here in the EU: "REGULATION (EU) 2019/1148" https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32019R1148&from=EN So as private citizen, there will be a problem to get

Photo is comparison of restrainers. 0= none, H2O2 = 12% hydrogen peroxide, S2O8 = 40% sodium persulfate, ClO3 = 25% sodium Chlorate, and AD= 25% ammonium dichromate. 1 drop of each in 2 ml

Non-dichromate Restrainer for Cuprotype I received a question about doing Cuprotype without a dichromate restrainer from someone in UK where it is very difficult to get dichromate. Originally I used

I was making them back when we met. I made a few for clients before the world got overwhelmed with digital negs, prints , computer updates snd the rest. Once I finish remodeling this house, I’ll

Hi Eric! Long time no see! Will add your name to the list. I’ve got 10 students and 1 alumnus in the class; we’ll see who continues on in the process after class is done so I can add more names to

I have made many but I’m not currently making them. Sent from my iPhone. So I may not recall what, when, why.... Confirm again later

I found this sensor. Www.nixsensor.com. I was hoping it could be used to read greyscales for platinum printing. -Felix

Thank you Chris - most useful. We shall be most interested to see any amendments too, enabling sharing of views and perhaps tech tips. Robert Sent from my iPhone; please excuse brevity.

Hi All, Compiling a list of chrysotype practitioners. This is what I have come up with from books and searching the web. Anyone not on this list that you all know of? Bob Schramm is no longer alive