D-23 Spiked With Sodium Hydroxide

Alan Johnson

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Bill troop pointed out that the quantity of Potassium Carbonate should be 19.5g of the anhydrous as there is no such thing as the monohydrate. FDC 2020 p 74 (left out the sodium hydroxide by mistake).

Acuspecial FX-21 formula (Better than Rodinal!)

FX-21 developer formula for 1+14 dilution. All weights in grammes per litre. I do not yet have any development times. Component Amount in grammes Rounded Amount Metol 2.1495 2.15 Sodium Sulfite 30.0 30.0 Hydroquinone 1.0995 1.1 Phenidone 0.1245 0.125 Sodium Metabisulfite 6.15 6.2 Potassium Carbon...
www.l-camera-forum.com
 
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Andrew O'Neill

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Alan, Mr. Caesar's FX-21 contains Sodium Hydroxide, the link to the formula you provided omits it. Which is correct?
 

Alan Johnson

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I believe this is correct except it should read 19.5g potassium carbonate anhydrous.
For a full explanation it seems to be needed to read right through the link given in post 51.
 
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chuckroast

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Pretty sure that almost no one here has an analytical balance or scale with that kind of resolution.

Pretty sure its unnecessary.

Even the jeweler's scales available for $20 online that claim .01g precision are unlikely to actually be accurate at that fine a degree of measurement. It's like adding 1+1 and claiming the answer is 2.000000000
 
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Andrew O'Neill

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Alan Johnson said:
I believe this is correct except it should read 19.5g potassium carbonate anhydrous.
For a full explanation it seems to be needed to read right through the link given in post 51.
Click to expand...

And no Sodium Hydroxide... Is that correct, Alan?
 
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Andrew O'Neill

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Alan Johnson said:
Not correct.
The formula linked in post 53 includes 5g sodium hydroxide which must be added.
Also the 22.035 g potassium carbonate monohydrate should be replaced by 19.5 g potassium carbonate anhydrous.
Click to expand...

Thank you.
 

john_s

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There is on line an errata for the 2nd edition, in which the omission of NaOH in that FX-21 formula is the only item. I can't find a link to it at the moment for some reason.
 
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Andrew O'Neill

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john_s

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The reference in the errata to
i-camera-forum.com
should have been
l-camera-forum.com
 

Trask

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Thanks for posting this formula -- I'd not found it previously.
 
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