Red color.This chakra represents base, root.
In Sanskrit the name for the first chakra is Muladhara, meaning root and support. Just like a tree, your Root Chakra is what grounds you to the Earth, creating the foundation on which you build your life.
The Root Chakra is associated with our feelings of safety and security, both physical and metaphorical.
Physically: any organs inside pelvic plexus, last 3 vertebrae, the anus, large intestine, feet and legs.
Physical location: SB.Ca