N-butylamine appears as a clear colorless liquid with an ammonia-like odor. Flash point 10°F. Less dense (6.2 lb / gal) than water. Vapors heavier than air. Produces toxic oxides of nitrogen during combustion.Butylamine is a colourless liquid which acquires a yellow colour upon storage in air. It is one of the four isomeric amines of butane. It is known to have the fishy, ammonia-like odor common to amines.Butan-1-amine is a primary aliphatic amine that is butane substituted by an amino group at position 1