Is there such an animal? Does anyone have a formula?
Please note PYROGALLOL.
Reuseable part "A"
Stain not important. So can have higher content of Sodium Sulphite.
Phenidone available to combine with the Pyrogallol.
Bath "B" to probably be Sodium Carbonate as a cheaper disposable solution can be made up. Or Sodium or Potassium Hydroxide?