Catechu Paste | Er Cha Chinese Herb - Substances for External Ailment - Medicinal Grade Chinese Herb 1 Oz Er Cha, Catechu Paste is a traditional chinese herb which suitable for external applications Helps to clear heat, clears the lungs, transforms phlegm and generates fluids Has bitter, astringent and neutral properties, and is act upon the lung meridian These are geo authentic herbs, sulfur free, lab tested and sourced indigenously Medicinal Grade Chinese Herb