Hi list members Those of you that own/have built a UV exposure unit, can you tell me the gap between each LED strip you have? Thanks John -- John Brewer www.thevictorianphotographer.com www.johnbrewer

Hope it works for you....be careful not to overheat it....and if you use this screw-cap https://www.dwk.com/duran-high-temperature-red-pbt-screw-cap-gl-45-with-ptfe-silicone-cap-liner-292402807 and th

Thanks a lot, Udo, I will soon try this method, quite simple and well described. Salvatore

Dear Salvatore, polymerized formaldehyde is paraformaldehyde see https://en.wikipedia.org/wiki/Paraformaldehyde Paraformaldehyde is used in molecular biology for perfusion of organs.....that means tha

Hi, does anybody know how to recover a polymerized old solution of formaldehyde? Thanks. Salvatore

I found the most important thing at a lens was its MTF test, but I ask where are the results for each l/mm ? If latest Zeiss lenses capture 700 lp mm and if we intended to understand how various grade

This topic deals with the opportunity to make available a kit containing all the necessary materials to produce a gum print to be used by absolute beginners who have generally difficulty in finding th

Hi to all, thank you very much for having accepted my subscription. I like to present myself.. I am a very very senior italian chemist, located in Milano, interested to the branch of old photographic

This topic deals with a list of books, papers and web sites devoted to gum printing.

This topic covers the techniques to use to assure a smooth and reproducible coating of the sensitive mixture to the prepared paper

This topic covers the modifications of the negative in order to obtain a print of the aspect desired.

According to my personal experience, gum printing is a very simple technique, but good results are very difficult. In particular, I found very critical the following three steps: 1) Paper and ink prep

Hi list, If there are people from Turkey working on or interested in alternative processes, can they reach out to me through e-mail? I am a newbie, collecting info on alt processes and history of phot

The Fresson's enlarger had been converted from an arc to a metal halide lamp before my visit to their workshop in May, 2003. While viewing the enlarger I remember Jean-Francois stated that shortly aft

Dear All, Thanks, listminders, for changing the alt list to one where we can post images. I think FB has been the bane of the alt list because it is so easy to post images and text on that forum. But

Hi All, I was hoping someone could help me out. I’ve an abundance (3g compared to 1g of Pd- so not really an abundance) of Na2 style platinum and was wondering 2 things: Could I some how make it in to

For any members interested in Platinotype, there will be a webinar this Friday at 3.30 pm EST, featuring my collaborator, co-author and friend, Pradip Malde: https://event.webinarjam.com/register/107/

Hiya all, I'm a complete newbie to this group so heads up, I'll probably do something wrong :o( Has anyone ever experimented with pre-flashing a coated paper (I work mostly in cyanotype) before exposi

Are the 365nm LEDs worth the extra investment? I print gum, cyano, Pt/Pd mostly. Thanks John -- John Brewer www.thevictorianphotographer.com www.johnbrewerphotography.com workshops:equipment sales:che

Hello all! So nice to have new life in this old forum… Thank you, Kees! I hope I’m posting this properly. I wanted to crowdsource some solutions to an aesthetic and historical question. A friend of mi