Metabisulfite in classic Rodinal

[River Mantis]

Why the classic Rodinal recipe (that one with 100 g/L p-AP HCL) asks for metabisulfite which is getting neutralised later instead of a plain sulfite? Has it something to do with solubility?

 

[Alan Johnson]

See Gerald Koch, post 44 here:

Rodinal - original recipe?

RobK, thanks for sharing more info!!!

www.photrio.com

Appears that originally bisulfite solution was used because it was cheaper.