Red
A pink color from the spectral lines of lithium.
Lithium compounds such as lithium nitrite produce a strong red when heated strongly in a Bunsen burner. You can see this by searching for lithium flame colour on youtube.com.You can see its spectrum on wikipedia.
When you burn lithium chloride, or any other lithium salt, you get a crimson flame, due to the positive lithium ions. The heat from burning the substance excites the outer electrons of the lithium ions to higher energy levels, when they drop back to the ground state, energy is released as light, and the wavelength of that light corresponding to that drop is crimson, hence we see a crimson flame.
Strontium and lithium are two elements whose compounds burn with a red flame and are commonly used in fireworks and signal flares. The strontium compound strontium nitrate and the lithium compound lithium carbonate are examples of substances that contribute to the red color in pyrotechnics.
Helium does not burn in a flame test because it is an inert gas and does not react with the flame to produce a characteristic color.
Lithium nitrate burns a bright red color. So, if you're looking to add a pop of fiery red to your next chemistry experiment, look no further than lithium nitrate. Just make sure to handle it safely, unless you're aiming for a different kind of red-hot situation.
A lilac-violet color
Strontium burns with a bright red color in a flame test.
Lilac to Purple-Red
Depending on the metal in the chloride (Na, Ca, Sr, Li, ....).
Cesium burns with a lilac or bluish-violet flame in a flame test.
When Magnesium chloride is burnt in a Bunsen flame, it imparts no colour in the flame.