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FormulasHypercat was developed by Jay DeFehr as a high acutance, catechol-based tanning/staining developer. Mixed in glycol, it has a long shelf life.


Hypercat A

Ascorbic Acid 1 g
Catechol 10 g
Propylene Glycol 100 ml


Hypercat B

Distilled water 750 ml
Sodium Carbonate 200g
Distilled water to make 1 L


People dilute this developer from 1:1:100 to 1:1:500.


You can learn more from Jay’s Hypercat forum.


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