Ferricyanide Bleach Acid Options?

I intend to do some B&W reversal on movie film. I have quite a bit of Potassium Ferricyanide and I'd rather use that than go buy color film bleach in a quantity I'll never use.

Is there any option to sulfuric acid for the bleach? What about citric acid? Pool (muriatic) acid?

What is the pH goal for a ferricyanide bleach?

Thanks!

I"m sorry, Alzheimers or something! Please don't reply to this post and maybe it will die an ignominious death.

Moderator, please delete?