The froehde reagent is ideal as a secondary test and has a very long shelf life. It lasts over 12 months if stored in the fridge and about 12 months if kept outside the fridge in a cool, dark place.
It will detect PMA and PMMA, giving a pale green reaction for either.
One bottle will give approximately 15 tests.
As with all reagent tests, the froehde reagent contains strong acid and should be handled with care.
Includes reaction result guide for common compounds.