Srimad Bhagavatam Canto 10, Chapter 79, Text 06

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.
Srimad Bhagavatam Canto 10, Chapter 79, Text 05
Srimad Bhagavatam Canto 10, Chapter 79, Text 07