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From the articles in the internet , I found that there are two reactions which are being called Lieberman nitroso test .

One is the test of 2 degree amine in which a 2 degree amine is converted to N - nitroso amine using nitrous acid . And this product reacts with phenol to form a red solution which turn blue on addition of alkali . Confirming the presence of 2 degree amine .

And another is the direct reaction of phenol with nitrous acid to form Indo-phenol giving same characteristic red and blue colour .

I am confused and have tried to refer to a lot of sources but with no success .

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