KSCN vs NaSCN

[Justas]

Hello,

currently researching on making my own BW developer for E6 process and there is a line in a recipe which states the use of NaSCN. As I imagine that the chemical is used to reduce grain in the film (also as thiosuphate).
The question is can I replace NaSCN with KSCN? The darkroom cookbook states that NaSCN is a substitute for potassium thiocyanate weight for weight. Can I do the same in reverse order?


TIA,
Justas

 

[Donald Qualls]

Thiocyanate is a halide solvent; its use in reversal first developer is mainly to produce clear highlights (and at higher concentrations, it can overall lighten the slide).

That said, if one is a sub for the other weight for weight, it shouldn't matter which direction you're substituting.

 

[Anon Ymous]

Yes, you can, but not weight for weight. You need to use equimolar amounts. Multiply NaSCN weight by 1,2 to get the equimolar amount of KSCN.