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1 result for “henna stain”
- The Perpetually Curious! › Canonical › Planet EarthArticle
🌍 Why Mud Is Brown or Black: Where Earth Turns to Quiet Ink
From section: 💡 Did You Know🟤 In some wetlands, dissolved organic compounds called humic substances can stain mud dark brown or nearly black, even when iron levels are low. These natural pigments come from the slow breakdown of plant material.