Charak Samhita
नीलं वा यदि वा कृष्णमाकाशमथवाऽरुणम्। पश्यंस्तमः प्रविशति शीघ्रं च प्रतिबुध्यते ॥३५॥
॥ Specific features of dosha dominant murchcha (syncope)॥ In vatika murchcha, the patient becomes unconscious after seeing the sky as blue, black or reddish and regains consciousness quickly.
english translation
nIlaM vA yadi vA kRSNamAkAzamathavA'ruNam। pazyaMstamaH pravizati zIghraM ca pratibudhyate ॥35॥
hk transliteration by Sanscript