# Question #65af7

$H N {O}_{3}$ is nitric acid, which is a colourless liquid.
The substance that has a reddish colour (or at least it gives off red fumes) is "Red fuming nitric acid" but that is a blend of 84% $N H {O}_{3}$, 13% ${N}_{2} {O}_{4}$ and a couple of percent water. It is used for rocket fuel applications, and is quite different from plain nitric acid.