Charak Samhita
यत् कृष्णमथवा नीलं यद्वा शक्रधनुष्प्रभम्। रक्तपित्तमसाध्यं तद्वाससो रञ्जनं च यत् ॥२४॥
Raktapitta is incurable if the blood is black, blue or of rainbow color and stains clothes. Bleeding with excessively fetid smell, in large quantities,
english translation
yat kRSNamathavA nIlaM yadvA zakradhanuSprabham। raktapittamasAdhyaM tadvAsaso raJjanaM ca yat ॥24॥
hk transliteration by Sanscript