That's a new concept to me, thanks.
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- Sat Nov 30, 2024 3:29 pm
- Forum: Gallery
- Topic: today's DCG
- Replies: 14
- Views: 294
- Sat Nov 30, 2024 1:30 pm
- Forum: General Holography
- Topic: Two-layer gelatin emulsions?
- Replies: 5
- Views: 1644
Re: Two-layer gelatin emulsions?
Thanks!
- Sat Nov 30, 2024 1:20 pm
- Forum: Gallery
- Topic: today's DCG
- Replies: 14
- Views: 294
Re: today's DCG
Thanks for mentioning the fixer concentration. It seems that some holographers use it straight, other prefer it diluted. I'm looking forward to trying the Kodak fixer. I tried it once with DCG, a long time ago, but I can't remember why I stopped using it. Today's result proves how important post-exp...
- Fri Nov 29, 2024 1:37 pm
- Forum: Gallery
- Topic: today's DCG
- Replies: 14
- Views: 294
Re: today's DCG
I did another exposure this morning, and changed a few processing variables. The plate was 29 days old at room temp, which seems like a long time to me, but it still (apparently) had some softness to it, since the upper left part shows quite a bit of milkiness/frostiness, suggesting softer gelatin i...
- Fri Nov 29, 2024 7:01 am
- Forum: Beginning Holography
- Topic: Help minimizing motion & can i skip the lamination?
- Replies: 4
- Views: 86
Re: Help minimizing motion & can i skip the lamination?
If you're using HX200, which is a slow material compared to silver, then I would avoid using wood. As a table, you can use a concrete paving slab from the home center, resting on a bicycle inner tube. The floor appears to be wood, which isn't ideal, but may not cause a problem. I don't recommend san...
- Fri Nov 29, 2024 6:41 am
- Forum: Gallery
- Topic: today's DCG
- Replies: 14
- Views: 294
Re: today's DCG
Thanks for the log entries. Having a form to fill in is better than my method of taking notes, because without a form, if you forget something, it may not be written down. With a form, the "vacant space" is obvious, and reminds you to fill it in. I like this idea, thanks.
- Fri Nov 29, 2024 6:37 am
- Forum: General Holography
- Topic: Two-layer gelatin emulsions?
- Replies: 5
- Views: 1644
Re: Two-layer gelatin emulsions?
Thanks for the thoughtful analysis. Kubota was my first guess, thanks for confirming this.
- Wed Nov 27, 2024 3:41 pm
- Forum: General Holography
- Topic: Two-layer gelatin emulsions?
- Replies: 5
- Views: 1644
Two-layer gelatin emulsions?
I've read quite a few papers on holographic recording materials using gelatin, but don't seem to recall any which had two or more layers of gelatin. In the case of DCG, say we laid down a 10-micron layer using one film formula, and then, after that one had dried, laid down another 10-micron layer on...
- Tue Nov 26, 2024 3:26 pm
- Forum: Gallery
- Topic: today's DCG
- Replies: 14
- Views: 294
Re: today's DCG
Well, since I'm now retired and Joy is busy making diffractive optics holograms on polymer, I can come clean :D :lol: Thanks for the very valuable info. My gelatin was melted at 50C and I may have seen the same blobs after the plates gelled. They were perfectly circular and about 5mm in diameter. T...
- Tue Nov 26, 2024 1:34 pm
- Forum: Gallery
- Topic: today's DCG
- Replies: 14
- Views: 294
Re: today's DCG
I used 300 bloom Knox gelatin. My method for technical was: 2 - 3 mins in fixer 2 - 3 minutes in room temp running water 1 min in 50% IPA (which step I sometimes skipped) 1 min in 75% IPA 1 min in 100% IPA 1 min in 100% IPA at 65 - 70 deg C (watch this step, the flash point of IPA is about 80!) Tha...