What physical piece of evidence is left in the tree in the story of Goodman Brown?

In Nathaniel Hawthorne's "Young Goodman Brown," the physical piece of evidence left in the tree is a pink ribbon belonging to Goodman Brown's wife, Faith. This ribbon symbolizes her innocence and purity, and its presence in the forest signifies the loss of faith and the transformation of Goodman Brown's perception of morality. The ribbon serves as a poignant reminder of the conflict between his ideals and the darker truths he encounters in the woods.