Blue.
Forgiveness is often associated with the color blue. This association stems from various cultural and symbolic interpretations. Blue is frequently linked to serenity, peace, harmony, and spiritual healing, all of which are connected to the concept of forgiveness. It's also associated with the throat chakra, which relates to communication and truth, both crucial aspects of offering and receiving forgiveness.
While forgiveness isn't a tangible object with a physical color, the symbolic association with blue provides a visual representation of its qualities.