I do support natural remedies. Not all are great for hair repeatedly. Lemon juice will have a drying affect on hair without balancers. As for color changes, you will see a slight change in hair color over time but it may not be the color you are trying to achieve. For instance, if your hair is dark brown and your wish is to be a light golden blonde highlights, lemon juice will not please you or yield results you are attempting to achieve. There’s a high possibility you will achieve underlying tones of red-orange.
Hope this helps, I am here to help you learn and correct more issues with your hair.