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sanking
09-23-2006, 02:12 PM
Ron,

Do you use alcohol in any of your emulsions?

I am curious to know if the addition of small amounts of alcoho in a gelatin solution would cause any hardening.

Sandy

Photo Engineer
09-23-2006, 02:58 PM
Ron,

Do you use alcohol in any of your emulsions?

I am curious to know if the addition of small amounts of alcoho in a gelatin solution would cause any hardening.

Sandy


Sandy;

I don't personally use it, but it was the surfactant of choice in the early years of coating silver halide emulsions. Plate coaters used it very much.

If you wish to use it, I suggest Everclear. I can give you specific amounts if you decide to try it.

See you this spring? I'm on the week before you this year.

PE

sanking
09-23-2006, 05:44 PM
Sandy;

I don't personally use it, but it was the surfactant of choice in the early years of coating silver halide emulsions. Plate coaters used it very much.

If you wish to use it, I suggest Everclear. I can give you specific amounts if you decide to try it.

See you this spring? I'm on the week before you this year.

PE

Ron,

I am scheduled June 10-15. Hope to see you again.

Thanks for the comment about the alcohol. I use it as a surfactant in making carbon tissue and was just wondering if it had any long term hardening effect. I have not noticed any, but thought I would ask.

Have you though any more about a carbon tissue coater? I just had a real messy session coating with the rod and it made me think of the project.

Best,

Sandy

Photo Engineer
09-23-2006, 06:05 PM
Ron,

I am scheduled June 10-15. Hope to see you again.

Thanks for the comment about the alcohol. I use it as a surfactant in making carbon tissue and was just wondering if it had any long term hardening effect. I have not noticed any, but thought I would ask.

Have you though any more about a carbon tissue coater? I just had a real messy session coating with the rod and it made me think of the project.

Best,

Sandy

Sandy;

Alcohols will not harden emulsions. They are mild surfactants, and the activity as a surfactant increases as the number of alcohol groups goes up on a molecule. Glycerine has 2 effects, one as a mild surfactant and another as a humectant. Sorbitol is another alcohol that can be used.

I have not been able to design an inexpensive carbon coater Sandy. Still thinking about it though.

I'll be at the Formulary from the 3rd - 8th teaching. I may be able to stay until you arrive.

PE

Bluenose Neil
09-27-2006, 07:12 PM
I always wondered how that worked.:)

Claire Senft
09-27-2006, 07:22 PM
Generally speaking I find if I have my Jello first and my vodka second that I am more satisfied with the fullness of my skin.

Helen B
09-27-2006, 08:42 PM
Sherry Trifle (http://www.bbc.co.uk/dna/h2g2/A663455)

"It is not known who first came up with the idea of combining jelly with cake soaked in sherry..."

Claire Senft
09-27-2006, 11:20 PM
In that case Helen I am going to visit the Patent Office application in hand. Thank you for the tip.