How will you distinguish between : `LiNO_3 and KNO_3`

Explanation

When `LiNO_3` is heated, it decomposes to yield reddish brown vapours of `NO_2`. However, when `KNO_3` is heated, it decomposes to yield colourless `O_2` gas.
`4LiNO_3 overset(Delta)to 2Li_2O + 4NO_2 uarr + O_2`,
`2KNO_3 overset(Delta)to 2KNO_3 + O_2`