Brihat Samhita
कापोतारुणकपिलश्यावाभे क्षुद्भयं विनिर्देश्यम् । कापोतः शूद्राणां व्याधिकरः कृष्णवर्णश्च ॥ ५-५६ ॥
If the disc be of the colour of the pigeon or of blood colour or of the colour of gold or yellow-black, mankind will suffer from starvation. If again the disc be black or as said above, of the colour of the pigeon, the Śūdras will suffer from disease.
english translation
kApotAruNakapilazyAvAbhe kSudbhayaM vinirdezyam । kApotaH zUdrANAM vyAdhikaraH kRSNavarNazca ॥ 5-56 ॥
hk transliteration by Sanscript