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As Fall approaches and leaves begin to drop, you may start noticing some marks on your pavers. This is caused by tannin left behind from leaves and other organic debris. Tannin marks are generally brown in color and can come from not just leaves but also wood, stems, bark, roots, etc. This is naturally occurring and most common in trees and leaves from the oak, willow, birch, and pine trees. Do not be alarmed if you see these marks. While the discoloration left behind ca