DefinitionThis section has been translated automatically.
ImplementationThis section has been translated automatically.
1 drop of a 1% nitrazine gel solution is applied to an area of skin (usually the back of the hand or forearm flexor). The reading is taken after 30 seconds, with dot or spot-like colour changes indicating blue-black zones of reduced alkaline resistance. If more than 10 such dots or spots are detected, the test is considered positive. S.a. Alkali neutralisation test and alkali resistance test.