[Alt-photo] Luis Nadeau

mineurdecharbon at skynet.be mineurdecharbon at skynet.be
Wed Oct 25 20:24:58 UTC 2017


DAS is NO DANGEREOUS !!!!!!!!




Philippe Berger
Carbon 14 Studio
Photographie d'Art au Charbon
http://www.philippeberger.net 
mineurdecharbon at skynet.be 



 
From: Kees Brandenburg via Alt-photo-process-list
Date: 2017-10-25 22:13
To: Joseph Smigiel; alt-photo-process-list
Subject: Re: [Alt-photo] Luis Nadeau
Hi Joe,
 
4,4'-Diazidostilbene-2,2'-disulfonic acid sodium salt (DAS) is a good replacement for dichromate in carbon and casein, but not for gum. At least in my testing.
It’s CAS Number is 2718-90-3
 
Kees
 
> On 25 okt. 2017, at 21:58, Joseph Smigiel via Alt-photo-process-list <alt-photo-process-list at lists.altphotolist.org> wrote:
> 
> IIRC, a couple years ago someone on the list suggested using a
> diazo-stilbene (?) compound as a substitute for the dichromates in gum
> printing. Did anyone on the list experiment with that compound? Results?
> 
> Joe
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