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  1. #1

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    Requesting the formula to Edwal FG7, or anything close to it.

    I have just purchase the last of the needed chemicals for making Edwal FG7. If anyone do have or know of that formula..., please post it.

    I know that there are much better developers available, but I just want this one. Its a "hang up" kind of thing.

    Thank You

    #1 Son

  2. #2
    PDH
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    Quote Originally Posted by #1 Son View Post
    I have just purchase the last of the needed chemicals for making Edwal FG7. If anyone do have or know of that formula..., please post it.

    I know that there are much better developers available, but I just want this one. Its a "hang up" kind of thing.

    Thank You

    #1 Son
    I have not much luck getting information from Edwal on Edwal 20, I have seen a few posts in the past for FG7, but most thought that the formula provided was not correct, much the same for Edwal 20. Hope someone has the correct formula.

  3. #3
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    Quote Originally Posted by PDH View Post
    I have not much luck getting information from Edwal on Edwal 20, I have seen a few posts in the past for FG7, but most thought that the formula provided was not correct, much the same for Edwal 20. Hope someone has the correct formula.

    Edwal published Edwal 20 so it's correct, the was a Super 20 which wasn't published.

    FG7 has never been published but uses NaCl formed by uses HCl and NaOH in the developer so in some ways is similar to Microdol/Perceptol.

    Ian

  4. #4

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    FG-7 is said to be based on Champlin #16. This has some credence since Edmund Lowe the founder of Edwal said that this was the only developer in Champlin's book that was worth anything. Another supporting fact is that both developers used chlorhydroquinone. The bad news is that this developing agent is no longer available. For a period of time Edwal has synthesized this chemical when it was no longer available. Before anyone asks the synthesis is NOT something you want to do at home. It requires two dangerous chemicals.
    Last edited by Gerald C Koch; 06-23-2014 at 02:04 PM. Click to view previous post history.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

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  5. #5

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    Thanks Guys, for the input.

    But I do have an MDS sheet on FG7, that mentioned "p-Benzoquinone", which I purchased 100 grams @98% purity. The document did not mention "chlorhydroquinone".

    So is there more information available that I have not seen or come across?

    #1 Son

  6. #6

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    Quote Originally Posted by #1 Son View Post
    Thanks Guys, for the input.

    But I do have an MDS sheet on FG7, that mentioned "p-Benzoquinone", which I purchased 100 grams @98% purity. The document did not mention "chlorhydroquinone".

    So is there more information available that I have not seen or come across?
    The chemical that you purchased is not a developing but used in the synthesis of chlorhydroquinone which is the developing agent used in FG-7. P-benzoquinone is a very nasty chemical. My advice is to return it to the seller or have it disposed of as toxic waste. I quote, "Potential Acute Health Effects:
    Extremely hazardous in case of eye contact (irritant), of ingestion. Very hazardous in case of skin contact (corrosive, irritant), of inhalation. Hazardous in case of skin contact (permeator). The amount of tissue damage depends on length of contact. Eye contact can result in corneal damage or blindness. Skin contact can produce inflammation and blistering. Inhalation of dust will produce irritation to gastro-intestinal or respiratory tract, characterized by burning, sneezing and coughing. Severe overexposure can produce lung damage, choking, unconsciousness or death. Inflammation of the eye is characterized by redness, watering, and itching. Skin inflammation is characterized by itching, scaling, reddening, or, occasionally, blistering."
    Last edited by Gerald C Koch; 06-23-2014 at 08:29 PM. Click to view previous post history.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  7. #7

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    The "P-benzoquinone" is a non returnable and non-refundable item. And if it is chlorhydroquinone, that I need. Do you or others, have any ideas as to where I might purchase 50 to 100 grams of the chemical?

    I want to get this project started.

    #1 Son

  8. #8

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    I seriously doubt that you will find a supplier that would be willing to sell small amounts. As I said this developing agent is no longer used except in FG-7 and Edwal is not able to find a supplier at a reasonable cost to them. I did find one company that sells 25 kg drums.

    Chlorohydroquinone's redox potential is close to that of Metol rather than its parent hydroquinone. When used alone it was a nice developing agent producing brown tones when used as a paper developer. But again not that special to keep it in use as developing agent. You might be interested in Agfa Studional (Rodinal Special) which like Champlin #16 uses triethanolamine to produce fine grain.

    The people who use Amidol are presented with the same problem and have to invest together and buy 25 kg at a time from a Chinese company. The price per pound is not that reasonable.
    Last edited by Gerald C Koch; 06-23-2014 at 11:55 PM. Click to view previous post history.
    A rock pile ceases to be a rock pile the moment a single man contemplates it, bearing within him the image of a cathedral.

    ~Antoine de Saint-Exupery

  9. #9

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    I found a supplier of "chlorhydroquinone". Its cost is $1120.00 for 100 grams @ 90% purity, plus shipping and handling.

    I will not and can not keep 25 kg of chemicals around my home. 1 to 5 pounds is the most that I would allow, for safety or any other reason. But 25 kg is totally out of the question.

    I am going to look into this buy, and see if I can swing it. Besides, I am stuck with the P-benzoquinon. So, in for a penny, in for a pound.

    #1 Son

  10. #10
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    Quote Originally Posted by #1 Son View Post
    I found a supplier of "chlorhydroquinone". Its cost is $1120.00 for 100 grams @ 90% purity, plus shipping and handling
    Even if you can find a supplier with more affordable prices, and if you can convince the supplier to sell and ship these chems to you, then you still don't have the recipe, and you can bet that Edwal is not going to hand it to you on a platter.
    Trying to be the best of whatever I am, even if what I am is no good.

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