The Bigen Cream Color 4-0 Dark Brown is a solid choice. The color is nice and the coverage on my gray hair is good. The one-push application is easy to use, although it can be a bit messy. Overall, I'm happy with this product.

The Bigen Cream Color 4-0 Dark Brown is my new favorite hair color. It's so easy to use and the color looks amazing on my hair. It covers my gray hair perfectly and lasts for a long time. Definitely recommend this product!

The Bigen Cream Color 4-0 Dark Brown is a solid choice. The color is nice and the coverage on my gray hair is good. The one-push application is easy to use, although it can be a bit messy. Overall, I'm happy with this product.

The Bigen Cream Color 4-0 Dark Brown is my go-to hair color. The one push application is so convenient and the color is a beautiful dark brown. It covers my gray hair perfectly and lasts a long time. Highly recommend!

I tried the Bigen Cream Color 4-0 Dark Brown and it was decent. The one push application is simple, but the color turned out a bit lighter than I expected. It also didn't fully cover my gray hair. It's an okay product for me.