PDA

View Full Version : Activating Gelatin



Pages : 1 [2]

Kirk Keyes
01-13-2009, 10:17 AM
Which will not work with anything but AgCl emulsions I would think.

It was the concepts about reference electrodes that I found good. Sure, we can't use a single junction as most of his info is geared at, but add in another junction and were closer.

Kirk Keyes
01-13-2009, 10:20 AM
Why do you need 2 ?

Ray - you need one, thicker silver rod for the silver specific half-cell, and then you need a thinner one to make the Ag|AgCl reference half-cell. Silver wire is fine for the reference cell, so 24 or maybe 20 ga. or so, and I'm guessing 12 or maybe 14 ga. for the silver electrode.

dyetransfer
01-13-2009, 10:42 AM
I can make you some. It costs me for Silver, heat, water and gelatin mainly. Lets tall off-line.

As for the meter, I need two pieces of silver wire right now, about 99% fine and about 6" long each.

I've been thinking of a jewelry hobby store or something.

Thanks.

PE



Hi Ron - I have a spool of silver wire somwhere. I had 100 feet of it custom made for some application that I can't remember. I also don't remember where I might have put it, but I'll take a look.

Regards - Jim

Photo Engineer
01-13-2009, 11:08 AM
Jim;

Thanks very much. I would like to buy some from you if you have it. I need about 1 foot. I may need two different types, as I'm still working on it. I can easily calibrate what I have as I have data tables of vAg in millivolts here, so it will not be too hard. I will publish the data here and/or in the book.

PE

Ray Rogers
01-13-2009, 12:17 PM
Ray - you need one, thicker silver rod for the silver specific half-cell, and then you need a thinner one to make the Ag|AgCl reference half-cell. Silver wire is fine for the reference cell, so 24 or maybe 20 ga. or so, and I'm guessing 12 or maybe 14 ga. for the silver electrode.

Oh, I wasn't aware you were making the ref as well.

Why does one need to be larger?

What do these gage's = ?
12
14
20
24
in terms of diameter (metric) ?

Kirk Keyes
01-13-2009, 01:50 PM
What do these gage's = ?


Ray, Google is your friend:
http://www.graphicproducts.com/supplies/wire_gauge.html

Kirk Keyes
01-13-2009, 01:54 PM
Why does one need to be larger?

The silver electrode will be hanging out in the emulsion and you want some mechanical strength, so bigger helps. In the reference electrode it can be smaller as it is sitting inside the enclosed cell where it is protected by the cell housing.

Ray Rogers
01-14-2009, 04:35 AM
Ray, Google is your friend:


And from that day forward, the Earth had itself a new God.

Kirk Keyes
01-14-2009, 10:15 AM
Amen!

dyetransfer
01-14-2009, 01:04 PM
Jim;

Thanks very much. I would like to buy some from you if you have it. I need about 1 foot. I may need two different types, as I'm still working on it. I can easily calibrate what I have as I have data tables of vAg in millivolts here, so it will not be too hard. I will publish the data here and/or in the book.

PE

Hi Ron - I'll take a look around here and see if I can locate it. The wire is pretty thin, I think that is why I had it custom drawn. For the life of me I can't remember what I used it for, but I'm pretty sure its around here somewhere.

Regards - Jim

sanking
02-06-2009, 12:55 AM
Hi

I am posting this because a friend gave me some original Kodak dye transfer paper thinking that I could use it as a base for carbon photography. Unfortunately it does work so well in this application unless I harden the paper, which takes some time.

I am wondering if you know anyone on this forum might be interested in this paper, for dye transfer work or for othe. If so I am willing to trade it to any interested party for about an equal amount of matt surface baryta photographic paper.

Not sure exactly how much of this I have, but I am estimating about 50 sheets of 11X14" and about 50 sheets of 16.5X21.5".

Sandy King




Hi Ron - I'll take a look around here and see if I can locate it. The wire is pretty thin, I think that is why I had it custom drawn. For the life of me I can't remember what I used it for, but I'm pretty sure its around here somewhere.

Regards - Jim

Kirk Keyes
02-06-2009, 10:23 AM
Sandy - maybe start a new thread with a title that's a little more related to the paper you're offering to trade?

wildbillbugman
02-06-2009, 11:02 AM
Sandy
Go to the Dye Transfer Group on Yahoo Groups.
Bill

sanking
02-07-2009, 01:41 PM
Thanks guys. I guess the message was a bit off-topic, but somehow it worked as I have been contacted by a party interested in the trading for the DT paper.

Sandy King