[Alt-photo] Platinum Rag arrived!

Christina Z. Anderson christinazanderson at gmail.com
Sun Apr 10 15:19:38 UTC 2016

Now I am wondering about trying DAS. What does DAS stand for?
If anything is going to stain it’ll be casein so this is good news!
It may be that with the ban on dichromate in the EU that DAS/casein becomes the new tricolor process.
It does not harden gum, though, correct?
What is exposure scale of DAS, Kees? How many stops?
Who first suggested using this?

On Apr 10, 2016, at 9:04 AM, Kees Brandenburg via Alt-photo-process-list <alt-photo-process-list at lists.altphotolist.org> wrote:

> We have been testing Hahnemühle Platinum Rag during the DAS Casein workshop yesterday and today. We used the paper unsized without preshrinking. My workshop participants found the Hahnemühle very easy to coat and also easy to ’develop’ in water. But this morning we did have registration problems with the second and following layers. Registration was ok in one direction and off in the other. This is often the case with papers that are not mould made. The missing deckle edges on the HPR 56x76 sheet could be an other indication for that… Do any of the beta testers have product information from H. about that?
> Otherwise DAS casein on unsized platinum rag is easy and has no staining in the whites! I suspect this will be the same for gum. Note that casein with DAS has a longer tonal range than casein with dichromates. And about the higher costs: we made about 35 A4  prints on 25x35cm sheets and have used 150ml DAS (0.5%) solution for that. This is the ridiculous amount of 0,75 gram DAS for al prints. Even at the highest prize I got it (€1,50 per gram) it’s still pretty cost effective...
> I’ll test HPR preshrunk tomorrow.
> Kees
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