And a happy birthday to Sophia!
It would be a real hoot if it worked. Perhaps an all-day exposure is in order LOL! Probably would run into some chemical fogging with that time scale. I'll have to think this thru for my next carbon tissue making and printing session. I could even make a "glass plate negative" by doing a single transfer onto glass. My usual imagery is ultra sharp, but what the heck.
Originally Posted by dwross
Hey Kirk! A big HB to Sophia! My boys turned 11 on Monday -- time flies!
At least with LF landscape, a bad day of photography can still be a good day of exercise.
Results are in
I have sensitivity studies on the new emulsion. As of yet I have not spectrally sensitized it (made it an ortho sensitive emulsion) and so you will have to make comparisons between raw, sulfur sensitized and sulfur + dye. It isn't hard if you just read below.
Picture #1 on the left is my 40 speed emulsion with ortho sensitization. At this point, no sulfur has been added and so it is about ISO 12. In the middle, you see what happens when you add the sulfur sensitization. The area under the curve is the speed of the emulsion.
On the right is the new raw emulsion. Its raw blue speed is nearly the speed of the middle emulsion which is ISO 40, and so when I finish the sulfur treatment, it will probably gain 1 - 2 stops at least.
The emulsion on the left was about 2 months old. It was the one shown in the DVD still posted here and has aged a bit unfortunately. The one on the right does not have green sensitizing dye. Why waste dye on an experiment? Right?
So, I think I have made a step forward. If this works out, the next step will be ISO 400. I lie. I gotta do all of this well before I go on from here and I think it will be too easy to fog it. Look at what happened to the one on the left. Too much light (IR) and time filming the DVD made it rather foggy. I also have to perfect UF washing, pumped makes and all of that stuff.
The defects you see are blisters and repellancy spots due to the fact that I used such small samples these were coated with no surfactant or hardener. For those that claim that an acid stop causes pinholes, the blister on the left scan shows how it actually shows up on unhardened or poorly hardened film. Not a pinhole, a blister.
The peak on the right is an artifact - a harmonic of UV, as I did not use a UV filter.
Last edited by Photo Engineer; 04-02-2008 at 10:08 PM. Click to view previous post history.
Is that solarisation I see on the right scan?
It looks as if the numbers are lighter than the rest, and there's a lighter area in the lower part of the test?
-- Ole Tjugen, Luddite Elitist
I am puzzled myself, but I think it is due to the extremely high speed. It is also probably helped by the lack of sulfur finish and by the lack of any other 'normal' addenda. But, since it is new to me, give me time to check it out properly. These are preliminary or first tests of something entirely new. I should have pointed that out.
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Originally Posted by Kirk Keyes
Happy, happy to Sophia. It's unbelievable that she is already two - almost as unbelievable as that my munchkin just turned 25. Carpe diem, indeed.
For those of you who have not met Sophia, she is a perfection of female kinetic power and beauty - one of those people you'll say about someday, "I knew her when she was a baby".
We're having company the next two weekends and I won't be able to get away, but I'm planning on having an open studio day (almost open - I'll need a head count beforehand. You know my parking situation ) Saturday of Memorial Day weekend. Maybe you can come then and drag along a PPF (Portland Photographers' Forum) member or two with you.
Dear Photo Engineer,
You need a business plan! And perhaps someone to help you figure out how you can recoup all your time and effort. When I think of all the pseudo-instructional photography books that cram the shelves of my local Borders, few of which seem to contain much new information, I think your work would stand alone, perhaps next to Wilhelm's book.
This might be anathema to you and all on this site, but a very good internet marketer who is a man of actual integrity is Perry Marshall (www.perrymarshall.com) who has helped a lot of different folks make their business ventures succeed. He is the type who will talk to you for half an hour to decide if he can meet your needs – and then charge you an amazing amount for the next half hour ; )
There – now I've raised a subject even uglier than that unmentionable pixel-based thing
Delighted I found this place,
J. Miller Adam
Glad to see you made your first post in the emulsion forum, Adam. I hope you contribute more in the future!
For up from the ashes, up from the ashes, grow the roses of success!
Congratulations on your progress!
When will your book/dvd be available for purchase? I'm keen to purchase a copy.
I have previewed Disk #1 for some people and hope to show #1 and #2 to a few people in 2 weeks. I have shown the book draft to a group of fellow engineers, but we only had time for a cursory glance and the consensus was that I was "almost there" and "going in the right direction". I have found that I may have to add another section to the book, for about 10 - 20 more pages.
Ole, in answer to your comment about solarization, the second batch also shows that same oddity, so I suspect that the new emulsion is more sensitive to solarization. Now, what is different, well, the Silver Nitrate is a new batch from a new source, the Gelatin is from a new source, and the Ammonia is from a new batch but old source. So..... One of my fellow engineers said I should take George Eastman's advice and "pray for the emulsion". I'm going to take that advice seriously.
But, the higher the speed, the harder things are to do "right". The emulsion will probably be about ISO 100 in-camera from my estimates right now.