In which reaction (s) blood red coloration is observed in product?

Why is blood red in colour?

In which of the following reactions, aromatic character is observed in the product formed ?

If on adding FeCl_(3) solution to acidifies Lassaigne's solution a blood red coloration is produced, it indicates the presence of

In the Lassaigne’s test, the blood red colouration is due to the formation of

Why the blood is red in colour?

Which gives blood red colour with ammonium thiocyanate