To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
While the listing calls these bottles black/flint glass, in reality they're just clear glass bottles coated in black paint. They all have leaky sprayer caps, and are hardly portable when the contents leak out.