Astanga Hrudaya
ताः शुभा मलिना रूक्षाः सङ्क्षिप्ताश्चाशुभोदयाः । वर्णमाक्रामति च्चाया प्रभा वर्णप्रकाशिनी ॥ ५१ ॥
and those dirty, dry, and brief (constricted, nonradiating) are malevolent (doing harm) Differences between chaya and prabha and their relevance in prognosis: Chaya (shade), engulfs (masks), the varna (colour) while prabha (complexion) brightens the colour.
english translation
tAH zubhA malinA rUkSAH saGkSiptAzcAzubhodayAH । varNamAkrAmati ccAyA prabhA varNaprakAzinI ॥ 51 ॥
hk transliteration by Sanscript