Thiocyanate: Sodium Versus Potassium

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• Nov 15, 2007

• #1

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

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• Nov 15, 2007

• #2

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

PE

 

OP

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• Nov 15, 2007

• #3

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