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  1. #1

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    Amidol soluble in TEA or Glycol?

    OK, I know this has been asked before, but I can not find/remember the answer. Is amidol soluble in either TEA or Propylene Glycol? If so, at what temperature?

    Sandy

  2. #2
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    It's probably not going to be used alone. The pH requirements depend lso on whatever is used with the amidol. I have done both, and prefer to use glycol because it allows playing with the alkali. The following is a pretty good developer.

    10 grams ascorbic or erythorbic acid.
    0.1 gram amidol
    Propylene glycol to 100 ml.

    !0 ml of this in 250 ml water will require 2 ml of TEA to work in a reasonable time. With 10 ml TEA it will develop HP5+ or whatever the current Arista II in about 6 minutes. In this case, of course, you can figure that almost 2 ml went to neutralize the ascorbic acid.
    Gadget Gainer

  3. #3

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    Yep, I mixed a bunch of Amidol stock concentrate in Propylene Glycol over a year ago. I have about 1500ml of the concentrate left and it is still fully active. I use it to mix Michael Smith's Azo developer recipe.
    Tom Hoskinson
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  4. #4

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    Tom,

    Was it very difficult to get the Amidol into solution with glycol? And what was the % solution you mixed. I tried to mix it with TEA but a lof of the Amidol settled out when the solution cooled.

    Sandy



    Quote Originally Posted by Tom Hoskinson
    Yep, I mixed a bunch of Amidol stock concentrate in Propylene Glycol over a year ago. I have about 1500ml of the concentrate left and it is still fully active. I use it to mix Michael Smith's Azo developer recipe.

  5. #5

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    Quote Originally Posted by sanking
    Tom,

    Was it very difficult to get the Amidol into solution with glycol? And what was the % solution you mixed. I tried to mix it with TEA once but a lof of the Amidol settled out when the solution cooled.

    Sandy
    Not very difficult to get most of it into solution. As a test, I heated 200ml of glycol to 140 F then stirred in 8 grams of amidol (magnetic stirrer/hotplate). The color of the solution was a deep Indigo. There was a very small amount of debris (particulates) in the bottom of the beaker that would not dissolve in glycol. I heated the solution to 160F with continuous stirring and the debris still did not dissolve. I cooled and then decanted the solution from the beaker and used it to make a liter of the MAS Amidol paper developer - the developer worked fine.


    I then put a few ml of deionized water into the beaker and the debris immediately dissolved - forming a blue liquid. I tested the blue liquid with a small piece of exposed film and the film quickly turned black. Thus, I believe that the debris was just more amidol.

    I subsequently (July, 2004) mixed another batch of Amidol/Glycol. I took 400ml of Propylene Glycol, heated it to 140F and stirred in 24 grams of Amidol, again, most of the amidol dissolved, but a small amount of debris remained in the bottom of the beaker. Then I cooled the solution and decanted everything into a 500ml bottle. I use 133 ml of this amidol stock solution (including any debris) together with the other ingredients from the MAS recipe to mix 1 liter of amidol print developer.

    I am inclined to try dissolving the remaining debris from this bottle of Amidol stock solution - (in a small amount of water), if the debris dissolve like before, I'll mix a few ml of glycol into it and see how long it lasts before it oxidizes and dies.

    If Pat Gainer reads this, I'd like him to comment.
    Tom Hoskinson
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  6. #6
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    I'm off to the dungeon again to see if it would be profitable to separate amidol base from the HCl.
    Gadget Gainer

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    Thanks Pat, I eagerly await your report from "The Dungeon!"
    Tom Hoskinson
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  8. #8

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    Quote Originally Posted by gainer
    I'm off to the dungeon again to see if it would be profitable to separate amidol base from the HCl.

    I am just not able to get all of the amidol into solution with TEA. In fact, a whole lot of it goes out of solution when the TEA cools down. With the TEA mixed 1:1 with glycol it dissolved much faster, and I don't see any debris on the bottom, even when it cooled down.

    Sandy

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    Quote Originally Posted by sanking
    I am just not able to get all of the amidol into solution with TEA. In fact, a whole lot of it goes out of solution when the TEA cools down. With the TEA mixed 1:1 with glycol it dissolved much faster, and I don't see any debris on the bottom, even when it cooled down.

    Sandy
    Thanks Sandy, that's an interesting piece of information. How much Amidol did you get into the TEA/Glycol solution?

    How does your TEA/Glycol/Amidol mixture behave? Have you tried mixing Michael Smith's Azo-Amidol Print Developer recipe with it?
    Tom Hoskinson
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  10. #10

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    Quote Originally Posted by Tom Hoskinson
    Thanks Sandy, that's an interesting piece of information. How much Amidol did you get into the TEA/Glycol solution?

    How does your TEA/Glycol/Amidol mixture behave? Have you tried mixing Michael Smith's Azo-Amidol Print Developer recipe with it?

    Well, it was an idea, but it does not appear to have worked. The solution appeared fine at first, but then when I mixed it to make a developer I got heavy staining.

    Visually the solution now looks thick, muddy, murky and very black.

    I await Gainer's report from the dungeon.

    Sandy

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