A color that is commonly used and easily seen at night is fluorescent or reflective yellow-green. This color is often used for high-visibility clothing, road signs, and safety equipment. It stands out well against a dark background and is highly visible even in low-light conditions. Other colors that are also noticeable at night include bright orange and reflective silver. These colors help to enhance visibility and ensure safety in various contexts, such as construction sites, outdoor activities, and emergency situations.