What color do true black horses exhibit in direct sunlight?

True black horses can exhibit a blue sheen in direct sunlight due to the way their coat interacts with light. This phenomenon is related to the structure of their hair and how it reflects and refracts light. The blue appearance is most noticeable when the horse is in bright light, showcasing an iridescent quality that contrasts with other common colors. This unique characteristic is a result of the black pigment in their fur, which can display vivid undertones when illuminated by the sun. Recognizing this behavior is essential for accurately identifying horse coat colors and understanding their visual characteristics in various lighting conditions.