Chemically, what is the major difference between solutions used for manual processing and those used for rapid and automatic processing?

There is more acid in rapid-processing solution.
Manual processing solutions are more alkaline.
Manual processing solutions contain more preservatives.
Rapid and automatic processing solutions contain more hardener.


Rapid and automatic processing solutions contain more hardener.

Rationale: Rapid and automatic processing solutions contain more hardener. – This hardening agent is added to facilitate the transportation of the films through the roller systems of the automatic units.

Health Professions

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