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Somehow you have got to have the material all gelled to start with and then able to be made even more gelled in the light struck anti-nodes so that their refractive index is greater than in the lightly gelled nodes… .….as demoed beautifully in DCG. What if you were to expose the entirety of the pho...

a thought that keeps coming up in my mind, what about PVA UV Glue.. like "DELO adhesives and PVA Dispensing System" I know when I was doing some work in pva it was easy to make refection holograms. Of course you can easily make PVA (PVOH) based photopolymers. Previously, they used to be m...

Hi Jeff, good to see you here again! You're absolutely right, the uv systems I mentioned don't quite look like a gel. That's why I added a "binder" like nitrocellulose etc. For the same purpose I equally tested a couple of traditional (solvent based) adhesives, epoxies, siloxanes, PU, meth...

Hi Martin I would be will to help you on this! I do have lots of free time which I can devote to this. can you share some in-depth Info .. so I can try this on my end :) thanks Any support is appreciated, thanks Danny. This D.I.Y thing ought to be seen as an open source project probably. I think em...

Anyone how the idea behind this coater? coat.PNG Hi ahgu, I suspect that it is using a Doctor Blade. Something like this: https://www.youtube.com/watch?v=f0OfjqKQwXg Steven. I think it's based on some kind of curtain coating (http://holotec.de/Produkte_und_Dienstleistungen/Beschichtungsanlagen/inde...

Martin, do you know why you can't record reflection holograms? Actually, I was able to record a reflection hologram - but its brightness wasn't very impressive, Dinesh. Perhaps the mechanism of recording on these adhesives forms surface profiles, but not Bragg structures within the adhesive? Do you...

Getting access to the necessary raw materials (monomers, photoinitiators etc.) used to represent the main difficulty when making your own photopolymers. But now there exist several photopolymer systems from a host of different areas, from 3D printing, paint, to adhesives etc., which are readily avai...

Triethanolamine (TEA) can be used for MB sensitized DCG – though at a very low concentration (and at the expense of photo speed). Jeff Blyth pointed out that TEA tends to form complexes with Cr3, largely preventing gelatin crosslinking. Moreover he mentioned a significant dark reaction under alkalin...

Thank you for the important info, Jeff.
Remains to emphasize once more the outstanding keeping properties of the ferric EDTA bleach.
My EDTA bleaching solution is about 25 years old and still working…

Good to "see" you here again, Jeff! For people not having access to Aldrich, the common route would probably be to get ferric nitrate/ ferric sulfate and sodium EDTA. Regarding Na EDTA I noticed that most alternative photography supply shops rather sell tri sodium than di sodium EDTA. I be...