Black vs Rainbow

Black

Black in dreams represents the unknown, the unconscious, mystery, and potential. It can be frightening (darkness) or elegant (black clothing). In dream work, blackness often represents what has not yet been brought to consciousness — vast potential waiting to be discovered.

Rainbow

Rainbows appear after storms and universally symbolize hope, promise, and beauty emerging from difficulty. A rainbow in a dream may indicate that a difficult period is ending and beauty is ahead. In Biblical tradition, the rainbow represents God's promise. In many cultures, the rainbow is a bridge between earth and heaven. The full spectrum of colors represents wholeness and the integration of all aspects of self.

Black

Represents the unconscious mind and everything not yet known to the dreamer

Rainbow

The quintessential symbol of hope — appears when the psyche wants to communicate that better times are ahead