Black.

Is a not colour of  strick understand, as absorbing colour, as opposite for white, as a play importance role in our life, as balancing for white,symbolizing  ying and yang  as without a dark is light not has, is infinity with a female force, but not allow for changes.As producing an own appreciation and manage, but and limit for relations between each other, his better ads with other colours, as this is creating a power energy combinations as black-red is physical sexual force.
Pink-black is high social position.
Yellow-pink is mental superiority, but black is protect you,in poor care, when wee are needing to be alone, in poor feeling reality, weak will, weak irresolution.
As affecting on the legs chakra.
Stones black are obsidian black, gagate, morion, black tourmaline, black pearl, hematite, smoke quartz, black coral, black nephrite, onyx.