FX-37: need help with the formula

[Robert Ridyard]

The formula for FX-37 published on APUG calls for 60 g of sodium sulpĥite. On other websites, the same formula requires 69 g of sodium sulphite. I even found a website that calls for 70 g.

Does anyone know which is the correct amount of sodium sulphite: 60, 69, or 70 g?

 

[Alan Johnson]

It was originally published in an article by Geoffrey Crawley , BJP 27 03 96 p24.
The APUG formula is correct, 60 g/L.
This gives the concentrate for subsequent dilution 1+3

 

[Alan9940]

I'm using right now mixed as per the article here; that is, 60 grams of sodium sulfite. I also went with the 1g/L on the bromide to eliminate the benzotriazole. So far, I've used it only on Delta 100 (120 format); very nice developer.

Best regards,
AlanH

 

[Gerald C Koch]

It was originally published in an article by Geoffrey Crawley , BJP 27 03 96 p24.
The APUG formula is correct, 60 g/L.
This gives the concentrate for subsequent dilution 1+3

+1

Having posted the formula given on APUG I agree fully. It is always best to go to the original source. IIRC my formula appeared in a BJP Annual article devoted to the Crawley formulas. These errors also point out the dangers inherent on the internet. However for the user they would probably see little difference with any of the formulas.

Always remember, NO HAS THE JOB OF PROOFREADER FOR THE INTERNET.

 

[Robert Ridyard]

Alan and Gerald: thanks for the info!