Valmiki Ramayana Kishkindha Kanda Sarga 23 Shloka 19

तस्य from his, व्रणेभ्यः wound, क्षतजधाराः streams of blood, धराधरात् from a mountain, ताम्रगैरिकसम्पृक्ताः red mixed with copper, धाराः इव like the streams, सर्वशः all over, पेतुः flowed.

The streams of blood that flowed all over from the wounds of his body appeared like streams of water mixed with red and copper colour.