Gerald, as an aside, I'm wondering about the chemistry of including both HQ and Catechol (albeit a very small amount of Catechol relative to HQ) with Phenidone. We typically consider HC-110 to be a PQ developer, and I supppose from a practical perspective it is, but why the addition of a small amount of Catechol which is similar to HQ?
A good question for which I have no answer. This puzzled me too as well as the change to Phenidone B from the Dimezone-S listed in the HC-110 applicable patent.


