[Alt-photo] Luis Nadeau

Kees Brandenburg workshops at polychrome.nl
Wed Oct 25 20:13:05 UTC 2017


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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