D-23 Spiked With Sodium Hydroxide

[Alan Johnson]

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

 

[Andrew O'Neill]

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

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

 

[Alan Johnson]

What you want is FX-21.

All weights in grammes per litre. For T-Max 400, use 1+9 for 11 minutes. For slower films (FP4+, T-Max 100, Delta 100), dilute more (1+14). For Pan-F, dilute 1+19, try 8 minutes to start.

For 15x concentrate:

Component​	Amount in grammes​
Metol​	2.1495​
Sodium Sulfite​	30.0​
Hydroquinone​	1.0995​
Phenidone​	0.1245​
Sodium Metabisulfite​	6.15​
Potassium Carbonate (monohydrated)​	22.035​
Sodium Bicarbonate​	3.9​
Sodium Citrate​	3.9​
Potassium Iodide​	0.0825​
Potassium Bromide​	0.33​
Sodium Hydroxide​	5.0​

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.

 

[chuckroast]

What you want is FX-21.

All weights in grammes per litre. For T-Max 400, use 1+9 for 11 minutes. For slower films (FP4+, T-Max 100, Delta 100), dilute more (1+14). For Pan-F, dilute 1+19, try 8 minutes to start.

For 15x concentrate:

Component​	Amount in grammes​
Metol​	2.1495​
Sodium Sulfite​	30.0​
Hydroquinone​	1.0995​
Phenidone​	0.1245​
Sodium Metabisulfite​	6.15​
Potassium Carbonate (monohydrated)​	22.035​
Sodium Bicarbonate​	3.9​
Sodium Citrate​	3.9​
Potassium Iodide​	0.0825​
Potassium Bromide​	0.33​
Sodium Hydroxide​	5.0​

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

 

[Andrew O'Neill]

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.

And no Sodium Hydroxide... Is that correct, Alan?

 

[Andrew O'Neill]

I also have one of those jeweller's scales. It's super sensitive, and a pain to use.

 

[Alan Johnson]

And no Sodium Hydroxide... Is that correct, Alan?

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.

 

[Andrew O'Neill]

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.

Thank you.

 

[Augustus Caesar]

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

Sodium hydroxide is needed. It was accidentally omitted in the FDC. See:

https://dupa.ie/wp-content/uploads/2023/03/Bill-Troop-Steve-Anchell-The-Film-Developing-Cookbook-2019-Routledge.pdf

 

[john_s]

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.

 

[Alan Johnson]

Film Developing Resources

{Moderators note - this links to the errata information referred to in the previous post}

 

[Andrew O'Neill]

Film Developing Resources

Thanks for posting that, Alan! Regardless of all the errors in that book, it's a huge source of info (I have an older copy given to me years ago by a former darkroom worker who also found many errors, and forwarded them to the authors).

 

[john_s]

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

 

[Trask]

What you want is FX-21.

All weights in grammes per litre. For T-Max 400, use 1+9 for 11 minutes. For slower films (FP4+, T-Max 100, Delta 100), dilute more (1+14). For Pan-F, dilute 1+19, try 8 minutes to start.

For 15x concentrate:

Component​	Amount in grammes​
Metol​	2.1495​
Sodium Sulfite​	30.0​
Hydroquinone​	1.0995​
Phenidone​	0.1245​
Sodium Metabisulfite​	6.15​
Potassium Carbonate (monohydrated)​	22.035​
Sodium Bicarbonate​	3.9​
Sodium Citrate​	3.9​
Potassium Iodide​	0.0825​
Potassium Bromide​	0.33​
Sodium Hydroxide​	5.0​

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