Does onion juice lighten hair color?
When applied to your hair, onion juice can give it a nice coppery shade and vibrant shine. However, if you do not want the color of your hair altered (especially those with light-colored or blonde hair), you can mix the onion juice with 1-2 teaspoons of mustard oil to prevent any unwanted lightening of your hair. Does onion juice makes hair white? Onion juice may be effective for hair loss in some instances.