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  1. #11
    eclarke's Avatar
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    I am obsessive about making all my chems. Ian steered me on to a homebrew bersion of Rodinal which I call Ianol. I have made two versions with different pH. The lower hydroxide version is the one I use and it's excellent at 1+50, jobo agitation @68 deg. The higher pH version is extremely close to Rodinal. I've used two gallns of the stuff so far...at 1+50!!


    I have made the quantity as follows because I can get the potassium sulphite in a 1 liter bottle and make a complete batch..

    Ianol:
    Higher pH
    p-Aminophenol.(free base) ................... 53 g-----58g new recipe
    Potassium sulphite 45% sol...................... 1L
    Potassium Hydroxide ........................... 54 g------59g new recipe
    Potassium Bromide ............................. 13 g
    Benzotriazole 1% ............................... 13 ml
    Water to make .................................. 1.3 L

    Stock pH 13.2

  2. #12

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    Collecting previous work,from Gainer,post 22:
    http://www.apug.org/forums/forum223/...ic-acid-3.html

    p-aminophenol.......1.1g
    Ascorbic acid.........8.8g
    Sodium hydroxide...2.4g
    Borax..................10g
    Water to..............1L

    pH 9-10

  3. #13

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    In another experiment I looked at making a developer from Paracetamol/Tylenol without using any sulfite.
    Note, Sodium Hydroxide is hazardous, caustic:
    http://www.ccohs.ca/oshanswers/chemi...hydroxide.html

    Solution A:
    I dissolved 20g sodium hydroxide in 250ml water, added 15g (contents of 30 capsules) Paracetamol whilst hot,with stirring.
    After filtering through cotton wool the solution was left in a 250ml sealed bottle for 72 hrs.The paracetamol hydrolyses to p-aminophenolate which is a developing agent.

    LS-1b Developer:
    Solution A above...............................50ml
    Ascorbic Acid....................................20g
    Sodium Carbonate photo grade anh.....6.7g
    Water to ..........................................1L
    pH~9

    HP5+ was developed in LS-1b 10m 20C, EI~250, see attachment showing 0.1 in square section of negative.
    It's a mid-acutance rather than fine grain developer.

    Later I may try washing soda crystals instead of sodium carbonate anh, the developer could then be made from Paracetamol,Caustic Soda pellets, Ascorbic Acid (Vitamin C from the health food shop) and washing soda crystals.
    Attached Thumbnails Attached Thumbnails LS-1b-1.jpg  

  4. #14

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    Slow progress on this one.
    After 46 days the pH of LS-1b has fallen from the initial 9 to 6.5 and it no longer works.It is falling towards the pH of sodium ascorbate and the only explanation I can think of is that free sodium ions that initially supported pH 9 may be complexed in some way and taken out of service by ascorbate.
    I may try less hydroxide to make solution A, needing less ascorbic acid,and possibly adding sodium bicarbonate to give some buffering, as ascorbate/carbonate did not work.
    It was in a nearly full bottle and the pH drop seems too much for the small amount of oxidation to have been the cause.

  5. #15
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    Alan - what just looking at the three photos you've posted, the first looks by far the best in terms of grain, the second starts to look mottled/clumped, and the third just above is looking like some form of reticulation. What do you think?

  6. #16

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    What you say may be true and the grain comparisons would need to be done again using the same film and scanning procedure for all.
    But first I would like to produce a developer that has a stable pH using paracetamol, sodium hydroxide, sodium carbonate, sodium bicarbonate and ascorbic acid only as these can all be obtained from local shops.
    I don't count sodium bisulfite used in wine-making as a local shops chemical so sulfite is not allowed.
    I'm looking at Ryuji Suzuki's DS-2 using p-aminophenol made from paracetamol in place of metol and without the sulfite, although this would not be fine grain:

    http://web.archive.org/web/200910051...s#Introduction

  7. #17

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    Another chemical mud pie noted:
    A moderately buffered solution was made to try to avoid the pH drop problem.

    Solution A (this is to hydrolyse Paracetamol/Tylenol to the developing agent sodium aminophenolate.)10% more sodium hydroxide than theoretically needed was used.
    Content of 16 Paracetamol capsules....................8g
    Sodium Hydroxide......................................... ..4.64g
    Water to................................................ .......100 ml
    Leave in a full sealed bottle for 1 week at room temperature for the hydrolysis to complete.

    LS-1b1
    Ascorbic acid.............................................. ......10g
    Solution A above............................................. ..50ml
    Sodium Bicarbonate....................................... ....10g
    Sodium Carbonate Decahydrate...........................10g
    Water to................................................ ............1L
    Develop for 1.5x Xtol 1+3 times.It worked at first.

    However this buffer did not stop the pH drop problem, initial pH of 9.0 fell to 8.8 after 7 days,7.8@14 days, 7.7 @23 days.
    I am now trying a more strongly buffered solution, 50g/L Sodium Carbonate anh equivalent.

    Note sodium hydroxide is caustic, hazardous:
    http://www.ccohs.ca/oshanswers/chemi...hydroxide.html

  8. #18

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    Quote Originally Posted by Alan Johnson View Post
    However this buffer did not stop the pH drop problem, initial pH of 9.0 fell to 8.8 after 7 days,7.8@14 days, 7.7 @23 days.
    Some time ago I was research some pH-stability issues in ascorbate devs. 1st replace ascorbic acid to sodium ascorbate or ascorbic acid with valid amount of sodium carbonate for produce sodium ascorbate. 2nd - make your buffer solution. For pH=9 try ~10g/l of Borax, or borax+sodium carbonate

  9. #19
    eclarke's Avatar
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    I have used gallons of this and it's excellent..

    ave made the quantity as follows because I can get the potassium sulphite in a 1 liter bottle and make a complete batch..

    Ianol:
    Higher pH
    p-Aminophenol.(free base) ................... 53 g-----58g new recipe
    Potassium sulphite 45% sol...................... 1L
    Potassium Hydroxide ........................... 54 g------59g new recipe
    Potassium Bromide ............................. 13 g
    Benzotriazole 1% ............................... 13 ml
    Water to make .................................. 1.3 L

    Stock pH 13.2

  10. #20

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    Quote Originally Posted by Relayer View Post
    Some time ago I was research some pH-stability issues in ascorbate devs. 1st replace ascorbic acid to sodium ascorbate or ascorbic acid with valid amount of sodium carbonate for produce sodium ascorbate. 2nd - make your buffer solution. For pH=9 try ~10g/l of Borax, or borax+sodium carbonate
    Hi Relayer,
    The unique feature of my developer, if I ever manage to produce a stable form,is intended to be that all the ingredients should be available from small town local shops, not internet.
    Viz:Paracetamol/Tylenol (aka acetaminophen), Sodium hydroxide (aka caustic soda or lye), Ascorbic acid (aka vitamin C), Washing Soda (aka sodium carbonate mono- or deca-hydrate) and Baking Soda (aka sodium bicarbonate).
    My health food store carries ascorbic acid but not sodium ascorbate. I cannot buy borax in local shops any more, there is some kind of EU ban. So I cannot use the chems you suggest.

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