SB 10.79.6
so ’patad bhuvi nirbhinna-
lalato ’srk samutsrjan
muñcann arta-svaram sailo
yatha vajra-hato ’runah
Translation:
Balvala cried out in agony and fell to the ground, his forehead cracked open and gushing blood. He resembled a red mountain struck by a lightning bolt.
Purport:
According to the acaryas, the demon appeared reddish with blood, like a mountain red with oxide.