Search found 23 matches

by ahgu
Tue Aug 21, 2018 9:19 pm
Forum: DCG
Topic: DIPPING crystallization problem
Replies: 1
Views: 4465

DIPPING crystallization problem

How can I dip in 6-10% AmDi/Water solution without getting the surface crystallized? What trick do you use?
I can do it in 3% solution without crystal forming on the surface, but it is not enough modulation.
by ahgu
Wed Aug 15, 2018 8:32 pm
Forum: Gallery
Topic: Chinese figurines and random stuff
Replies: 4
Views: 5507

Re: Chinese figurines and random stuff

Pluto, It looks amazing.
What gelatin do you use? What do you do to get it so sharp ? Can you post your procedure?
by ahgu
Fri Aug 03, 2018 12:17 pm
Forum: Gallery
Topic: Girl in fishnet
Replies: 5
Views: 7418

Re: Girl in fishnet

is it based on DCG? Is it based on real person? strong 3D?
by ahgu
Sun Jul 22, 2018 11:06 am
Forum: DCG
Topic: coating help needed
Replies: 9
Views: 8181

Re: coating help needed

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...
by ahgu
Sun Jul 15, 2018 10:10 am
Forum: DCG
Topic: coating help needed
Replies: 9
Views: 8181

Re: coating help needed

http://www.holographyforum.org/data/pdf ... tation.pdf

Anyone how the idea behind this coater?
coat.PNG
coat.PNG (671.69 KiB) Viewed 8136 times
by ahgu
Thu Jul 12, 2018 11:22 am
Forum: DCG
Topic: coating help needed
Replies: 9
Views: 8181

Re: coating help needed

Shim is about 50um. Final dried thickness about 7-8um thick.

What is the cause of the whiteness after developing? I don't get this with high bloom GEL , but get it with this type of 214 , 29.6mp viscosity, 5.3ph gelatin.
by ahgu
Wed Jul 11, 2018 2:17 pm
Forum: DCG
Topic: coating help needed
Replies: 9
Views: 8181

Re: coating help needed

The white is another issue. I suspect the cause was
1. the solution was not overnighted.
2. Did not wash out all the D after fixer.

I suspect 1 might be main cause. The gelatin needs time to form better bonds. Correct me if wrong.
by ahgu
Wed Jul 11, 2018 2:11 pm
Forum: DCG
Topic: coating help needed
Replies: 9
Views: 8181

coating help needed

I don't know how Rallisson did his pin coating. I cannot get uniform coating with DCG. See picture below. solution about 5-25-120. Temp 40-50C. veil coat it first then spin at 80RPM Under regular light, it is very obvious it is not even. coating2.jpg I also tried mold coating. Looks good until devel...
by ahgu
Fri Apr 27, 2018 11:43 am
Forum: DCG
Topic: Milkyness in dcg
Replies: 36
Views: 25362

Re: Milkyness in dcg

Joe,

Can you give me the ratio in weight? Not sure if the % is in mole?




I'm using a post-exposure bath which works well, as follows:

Part 1: Sodium Metabisulfite (1% solution in water)
Part 2: Aluminum Sulfate (0.2% solution in water)
by ahgu
Tue Jun 06, 2017 11:10 pm
Forum: General Holography
Topic: Sealing DCG
Replies: 4
Views: 2587

Re: Sealing DCG

Did you find an epoxy with refractive index around between 1.4-1.45? Seems that is close to to the DCG.