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Go Back   APUG > Recipes > Alt. Process > B&w slide tried and true process

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Old 01-27-2008, 07:19 AM   #31 (permalink)
 
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The Permanganate should be acidified with Sulphuric acid.
Not necessarily.
Any strong acid would do.
Sulphuric is recommended only because it's readily available.
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Old 01-27-2008, 07:20 AM   #32 (permalink)
 
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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.
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Old 01-27-2008, 08:08 AM   #33 (permalink)
 
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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
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Old 01-28-2008, 05:05 PM   #34 (permalink)
 
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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.
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Old 02-25-2008, 04:33 PM   #35 (permalink)
 
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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?
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Old 02-25-2008, 09:04 PM   #36 (permalink)
 
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I should have RTFM, muriatic acid IS hydrochloric acid. Ooops.
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Old 02-25-2008, 11:25 PM   #37 (permalink)
 
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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".
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Old 02-27-2008, 09:56 PM   #38 (permalink)
 
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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!
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Old 02-28-2008, 08:15 AM   #39 (permalink)
 
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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.
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Old 07-17-2008, 02:31 PM   #40 (permalink)
 
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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.
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