lilac
Potassium has a violet color in the flame test.
Reaction of Li with H2O
Potassium produces a lilac flame
Lilac to Purple-Red
A lilac-violet color
K+ Potassium
Potassium has a violet color in the flame test.
When flame tested, Sodium ions range from a yellow to a bright orange flame and Potassium ions give a lilac or light purple flame. Neither the Sulphate nor the Chloride ions should have emission spectra in the visible range.
Lithium flame gives a lilac colour when ignited.
If you were to spray potassium over a Bunsen burner flame it should emit a lilac/purple colored flame due to the presence of potassium ions.
Lithium shows Crimson red and Potassium shows Lilac (pale violet)