A place to discuss holography
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by vasimv » Tue Sep 03, 2019 3:55 pm
Martin wrote: ↑Tue Sep 03, 2019 9:56 am vasimv wrote: ↑Sun Sep 01, 2019 9:05 pm I usually just add few drops of 10% soduium lauryl sulfate solution and it helps for gelatine and PVA emulsions enough to stay on the glass unless additional reprocessing with longer water exposure used. That's interesting. Usually surfactants are said to have a negative impact on layer adhesion (I never tried sodium lauryl sulfate though).
vasimv wrote: ↑Sun Sep 01, 2019 9:05 pm I usually just add few drops of 10% soduium lauryl sulfate solution and it helps for gelatine and PVA emulsions enough to stay on the glass unless additional reprocessing with longer water exposure used.
by Martin » Tue Sep 03, 2019 9:56 am
by vasimv » Sun Sep 01, 2019 9:05 pm
Joe Farina wrote: ↑Sun Sep 01, 2019 5:53 pm Around 1999 or so, Jeff Blyth published his silver halide diffusion method (which I think he updated and improved since then). I think in one of his papers (about that time or later), he detailed his glass preparation method. The diffusion method required that the gelatin adhere strongly to the glass. This involved the use of the 3-aminopropyltriethoxysilane which I mentioned earlier.
by Joe Farina » Sun Sep 01, 2019 5:53 pm
vasimv wrote: ↑Sun Sep 01, 2019 5:16 pmWorst problem is emulsion tends to peel off (like in upper-left corner - dots in areas where emulsion got removed) after that.
by vasimv » Sun Sep 01, 2019 5:16 pm
Joe Farina wrote: ↑Sun Sep 01, 2019 3:48 pm Wow, nice hologram. Quite a red-shift if you're exposing at 405nm. I think this really proves the viability of the ferric system, at least with your environmental conditions.
Joe Farina wrote: ↑Sun Sep 01, 2019 3:48 pm The collagen seems to be working well -- what concentration and soak time did you use? The end result looks clean, did you have any difficulty with the uniform removal of the collagen solution?
Joe Farina wrote: ↑Sun Sep 01, 2019 3:48 pm I wonder if post-exposure baking will have a positive effect. With my MBDCG, it's definitely part of my processing schedule. A long, low-temperature bake after exposure seems to enhance hardening in exposed areas, without having other adverse effects. It may be different with ferric compounds, but might be worth a try. I bake at 65C for two hours, immediately after exposure. In my case, this produces noxious fumes (not sure of the exact cause) but the ferric system may be better in this respect. I do the baking in a portable oven, in a separate shed.
by Joe Farina » Sun Sep 01, 2019 3:48 pm
by vasimv » Sun Sep 01, 2019 10:05 am
by vasimv » Mon Aug 26, 2019 10:01 am
by vasimv » Sat Aug 03, 2019 1:24 pm
Martin wrote: ↑Sat Aug 03, 2019 8:47 am I've encountered this kind of problem many times. I thought it was due to a defective coating or a layer of insufficient thickness.
by Martin » Sat Aug 03, 2019 8:47 am
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