I Put My Images Where My Mouth Is
Hello to All,
For Some time now, I have been blabing on this Forum that I am working on a Silver-Halide emulsion without gelatin. I have now solved the last known problem with my formuls, which was bubbles upon drying.
First, I must apologize for the fact that I can not disclose the nature of the "gelatin substitute", as it is covered by a Confidentiality Agreement which I have with a company which, I hope, will manufacture and market it. Also, there is a processing step in the making of the actual emulsion that I will, for now, keep confidential.
I will mention the following:
1) This is a glass negative emulsion.
2)The emulsion contains no animal or plant derivatives,such as gelatin,gums or startches.
3) The emulsion is an Ag/Br/I emulsion
4) Once the "gelatin substitute" is in hand, the emulsion is VERY simple and easy to make.
5) Without S or Au sensitizers the ISO is 40. With S and Au sensitizers the ISO is about 320.
6)The images I have attached are blue sensitive only. Making an Ortho Emulsion is easily done with adition of the green sensitive emulsion that PE has recommended, SDE3006. Or,alternatively, I could have added erythrosine prior to percipitation. All this is not speculation. I have actualy done these things with earlier makes of the same formula. Within the next couple of days, I will post images of the faster emulstion and of the ortho emulsion.
7) The emulsion looks and coats much like a silver/gelatin emulsion,EXCEPT that it dosn't set-up like gelatin. It must actualy dry in the dark. This takes about 3 to 8 hours with hardener, which is glyoxal.
I look forward to more!
For up from the ashes, up from the ashes, grow the roses of success!
That's just, like, my opinion, man...
Can you tell the group how you achieved such a high speed emulsion or is this related to the gelatin substitute?
Great work Bill. Congratulations.
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Why does your first example plate remind me so much of this??
"When making a portrait, my approach is quite the same as when I am portraying a rock. I do not wish to impose my personality upon the sitter, but, keeping myself open to receive reactions from his own special ego, record this with nothing added: except of course when I am working professionally, when money enters in,—then for a price, I become a liar..."
— Edward Weston, Daybooks, Vol. II, February 2, 1932
Great stuff, Bill!
Of course I make prints with gelatin, but no silver, but I don't think it would work well in-camera!
At least with LF landscape, a bad day of photography can still be a good day of exercise.
I can tell you part of it now. The other part, I will discuss with my counterpart on the "other side" of the Confidentiality Agreement".
Originally Posted by Emulsion
For S/Au senitization, I use Steigmann's Solution. Not the Hypo/Au combination recommended by most modern emulsion makers. For some reason, which I do not pretend to understand, the Steigmann's has worked better with this type of emulsion. Also, I use quite a bit more than is usualy suggested.
I have an OT question though, is that Little Mountain in the second photo?