Thiocyanate: Sodium Versus Potassium

[Snapshot]

Hi All,

I've found a formula for a E-6 colour first developer that uses potassium thiocyanate. However, I have sodium thiocyanate on hand. Are the two exchangeable for this purpose? My gut feel says they are but I don't want to presume that is the case.

Any thoughts?

 

[Photo Engineer]

Yes. You must adjust the amount of salt based on molecular weight though.

PE

 

[Snapshot]

Understood. Thanks for the confirmation. I'll have to add 20% more Sodium Thiocyanate.