Milkyness in dcg
Posted: Fri Mar 01, 2013 2:02 pm
No worries! Please continue with Milan's problem. Sorry to interrupt.
A place to discuss holography
https://www.holographyforum.org/forum/
This is not my idea. I read next document:Tony DCG wrote:I would be surprised if this works. That is some very high humdity. I'm not sure what you wish to accomplish in trying this but it could be interesting.MilanKarakas wrote:I just wanted to be sure that there is no condensation on upper surface, while humidity is pretty high (over 85% measured). As temperature goes down, humidity will goes dow slowly as well.
No, sensitivity is not an issue at the moment, but yes you are right (article about storage time, and about sensitivity):Tony DCG wrote:If you look at the great centers of DCG like Utah, New Mexico (USA) where they mass produce DCG, the humidity is very low. This can be argued of coarse but I think ideally you want low RH to dry film. Now if you wish to have your film more sensitive meaning less exposure time, then you can shoot in high temperature and high humidity. I've have heard theroies as to why that is but basiclly it comes down to control. Film stores longer in a low RH low temp environment. Anyway, no matter. It is great you are trying things out. You will adopt your own ideas based on experiements and in the end you will be better for it.
You are also right about different gelatin type. Perhaps all that idea about messing with aging and different way of drying and dealing with the emulsion is futile if gelatin I have is by default bad for the holographic purpose. Or too soft, or has too much additives (I bet too much additives, and too soft as well).Tony DCG wrote:I'm happy you are trying a different gelatin. That's where my money is. I will again offer some of mine if you would like. I again say this so that you can minimize the amount of variables you have. If you have know good gelatin, you look at other parts of your process if the problem persist.
Thank you for good ideas,Tony DCG wrote:As always, best of luck and thanks for posting!
MilanKarakas wrote:But my concern is currently about proper "annealing" or proper "aging" of the emulsion (in hope to get less milk, more image).MilanKarakas wrote:DCG Masters for Single Beam Photopolymer CopiesRichard D. Rallison
Tony DCG wrote:[/R Rollison was a great DCG holographer so who am I to foo foo what he is saying. If your goal is narrow band holograms then indeed this works fine. I simply store mine in a cooler (depending on weather I might regulate it with a cooling system) and some dissicant to keep it dry. A week is fine although even after a month it seems to work fine. If your goal is to get less milkiness then just age it. IMO humidity and heat ages film but not in a good way it will desensitize it so be careful. I guess heating is OK but again IMO results will vary, by how much is hard to say. Richard found a method that works for him as I did and as you will.MilanKarakas wrote:But my concern is currently about proper "annealing" or proper "aging" of the emulsion (in hope to get less milk, more image).MilanKarakas wrote:DCG Masters for Single Beam Photopolymer CopiesRichard D. Rallison
This is where I started. State of the art simple. http://www.holograms3d.com/MakingHologr ... graphy.htm
[/quote="MilanKarakas"]Maybe you are right about all of that. If gelatin is wrong, then no matter what I try it will give me the same bad results. But, I want to be sure that my procedure is correct.
Yes I hear you Been there . You sometimes have to kiss a lot of ugly girls before you get a pretty one:)
Keep up the fine work!!
HOLY S%#& ...... How did i miss this one. Its the best quote of the thread! RFLOL ! Thanks Tony (and the rest of you guys too!)Tony DCG wrote: You sometimes have to kiss a lot of ugly girls before you get a pretty one:)