Discussions: 45,157 | Messages: 608,938 | Members: 29,916 | Online: 383 | Chatroom: 0
User Name:  Password:
 

"That is called grain. It is supposed to be there." -Flotsam


 
APUG search    RSS MOBILE
Customize Sidebar
Gum-Silver Process
Author: Dwane
1102 view(s)
aj 12 + various things
Author: jnanian
635 view(s)
Kodak D-19
Author: Tom Hoskinson
950 view(s)
Go Back   APUG > Recipes > Alt. Process > B&w slide tried and true process

Reply
 
Thread Tools Display Modes
Old 01-27-2008, 07:19 AM   #31 (permalink)
 
Join Date: Oct 2004
Posts: 232
Default

Quote:
Originally Posted by Ian Grant View Post
The Permanganate should be acidified with Sulphuric acid.
Not necessarily.
Any strong acid would do.
Sulphuric is recommended only because it's readily available.
Alessandro Serrao is offline   Reply With Quote Ignore this user Ignore this thread Ignore this forum
Old 01-27-2008, 07:20 AM   #32 (permalink)
 
Join Date: Oct 2004
Posts: 232
Default

Quote:
Originally Posted by wildbill View Post
I'm in search of the chemicals for the above process but i want to make sure i'm getting the right SODIUM BISULFATE. Artcraft doesn't have it listed and i've only found it at two places that want about $40 per 125grams. Does this sound right? That seems pricey when i'd need 1/3 or that for a batch of bleach. Can someone post a link to a source? Is this something i can get at a pool supply store?
vinny

Soudium Bisulfate it's available as a Ph minus from any shop that sells pool chemicals.
Alessandro Serrao is offline   Reply With Quote Ignore this user Ignore this thread Ignore this forum
Old 01-27-2008, 08:08 AM   #33 (permalink)
 
Ian Grant's Avatar
 
Join Date: Aug 2004
Location: Turkey (West Midlands, UK)
Posts: 4,676
Default

Quote:
Originally Posted by Alessandro Serrao View Post
Not necessarily.
Any strong acid would do.
Sulphuric is recommended only because it's readily available.
Not at all true, if you use Hydrochloric Acid you will re-halogenate the silver developed in the first developer and then this will be exposed and developed again.

Ian
__________________
My APUG portfolio
Ian Grant is online now   Reply With Quote Ignore this user Ignore this thread Ignore this forum
Old 01-28-2008, 05:05 PM   #34 (permalink)
 
Join Date: Oct 2004
Posts: 232
Default

Quote:
Originally Posted by Ian Grant View Post
Not at all true, if you use Hydrochloric Acid you will re-halogenate the silver developed in the first developer and then this will be exposed and developed again.

Ian

Good to know.
I'm only developing by trial and error.
Alessandro Serrao is offline   Reply With Quote Ignore this user Ignore this thread Ignore this forum
Old 02-25-2008, 04:33 PM   #35 (permalink)
 
Join Date: Oct 2004
Location: Valdosta, GA.
Posts: 819
Default

Are there any convenient sources of sulfuric acid that are available possibly locally without having to source it through a chemical supply house?
Is muriatic acid a possible substitute?
Phillip P. Dimor is offline   Reply With Quote Ignore this user Ignore this thread Ignore this forum
Sponsored Ad. (Subscribers to APUG have the option to remove this ad.)

Old 02-25-2008, 09:04 PM   #36 (permalink)
 
Join Date: Oct 2004
Location: Valdosta, GA.
Posts: 819
Default

I should have RTFM, muriatic acid IS hydrochloric acid. Ooops.
Phillip P. Dimor is offline   Reply With Quote Ignore this user Ignore this thread Ignore this forum
Old 02-25-2008, 11:25 PM   #37 (permalink)
 
Join Date: Jan 2007
Posts: 143
Default

Sodium Bisulfate, when dissolved in water becomes a complex of sulfuric acid and sodium sulfate. I use it successfully in my bleach. I find it easier to handle, measure, clean up, etc.

You can find some at a pool supply store. It is sometimes sold as "pH down".
amuderick is offline   Reply With Quote Ignore this user Ignore this thread Ignore this forum
Old 02-27-2008, 09:56 PM   #38 (permalink)
 
Join Date: Oct 2004
Location: Valdosta, GA.
Posts: 819
Default

Thanks for the heads up. Not that I have anything to hide from the DEA but I find that filling out that form and subjecting myself to their scrutiny would not be worth it in the least for 100ml of sulfuric acid.


Thanks again!
Phillip P. Dimor is offline   Reply With Quote Ignore this user Ignore this thread Ignore this forum
Old 02-28-2008, 08:15 AM   #39 (permalink)
 
Join Date: Jan 2007
Posts: 143
Default

You can buy sulfuric acid at an auto supply shop. They keep it behind the counter. It is used to top off lead-acid batteries. Just figure out the concentration and dilute down.

BTW, I wouldn't concern yourself with the DEA form. Do you know how many people fill those out every day? You are a grain of salt in the ocean.
amuderick is offline   Reply With Quote Ignore this user Ignore this thread Ignore this forum
Old 07-17-2008, 02:31 PM   #40 (permalink)
 
Join Date: Oct 2004
Posts: 232
Default

Quote:
Originally Posted by amuderick View Post
You can buy sulfuric acid at an auto supply shop. They keep it behind the counter. It is used to top off lead-acid batteries. Just figure out the concentration and dilute down.

BTW, I wouldn't concern yourself with the DEA form. Do you know how many people fill those out every day? You are a grain of salt in the ocean.

I agree.
Alessandro Serrao is offline   Reply With Quote Ignore this user Ignore this thread Ignore this forum

APUG.ORG Block Ads. (APUG Subscribers have the option of closing this block)
 


  Contact Us - Advertise on APUG - Archive - Top - Site Terms - Forum Rules  
    

All times are GMT -5. The time now is 05:32 PM.
  
All Content Copyright © 2002-2008 Photocentric Ltd.   Search Engine Optimization by vBSEO APUG.ORG is a division of Photocentric Ltd.
This site is best viewed with a resolution of 1280x1024 (or higher), we recommend using