Flame test color for non-ionic compounds

What color would a non-ionic compound, such as $$\ce{NH4OH}$$ or $$\ce{HCl}$$, produce in a flame test? Is no color produced, or is it different for each compound?

• I'm confused. I would consider both $\ce{NH4OH}$ and $\ce{HCl}$ to be ionic compounds.
– MaxW
May 11 '19 at 3:29

Ordinary flame like the Bunsen burner is way too cold for non-metals. However if we were to heat HCl or ammonium hydroxide in a confined "container" at very high temperatures say, 5000 - 10,000 $$^oC$$, eventually you would start to see atomic emission from hydrogen, oxygen, nitrogen and chlorine. Most of the non-metal emission (p-block) lies in the UV or deep UV. You won't be able to see anything with bare eyes.