Charak Samhita
संसर्गाल्लोहितप्रदूषणाल्लोहितगन्धवर्णानुविधानाच्च पित्तं लोहितपित्तमित्याचक्षते ॥५॥
॥ Lohitapitta॥ Pitta gets the name lohitapitta because after mixing with blood it acquires the color and smell of blood.
english translation
saMsargAllohitapradUSaNAllohitagandhavarNAnuvidhAnAcca pittaM lohitapittamityAcakSate ॥5॥
hk transliteration by Sanscript