I've been using the Bigen Cream Color 4-0 Dark Brown for a while and it's been great. The one push application is convenient and mess-free, and the color is a nice dark brown shade. It covers my gray hair well. Good product overall.

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.

I love the Bigen Cream Color 4-0 Dark Brown! It's so easy and convenient to use. The one-push application is a game changer. The color is rich and the coverage on my gray hair is excellent. I will definitely be repurchasing this product.

Overall, I'm satisfied with the results of the Bigen Cream Color 4-0 Dark Brown. The color turned out nice and the coverage on my gray hair was decent. The one-push application was convenient, although it did get a bit messy. I would consider repurchasing this product.

I've been using the Bigen Cream Color 4-0 Dark Brown for a while now and it never disappoints. The color is rich and the application process is quick and easy. It covers my gray hair perfectly and leaves it looking natural. Plus, the fact that I can save the remaining product for later use is a huge money saver. Highly recommended!