Nitrazine yellow test

Author: Prof. Dr. med. Peter Altmeyer

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Last updated on: 29.10.2020

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Definition
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Orienting test for the evaluation of the alkaline resistance of the skin, especially in toxic-degenerative eczema (disturbance of the normal skin pH-value).

Implementation
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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.

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Last updated on: 29.10.2020