Blue represents peace, tranquility, calm, stability, harmony, unity, trust, truth, confidence, conservatism, security, cleanliness, order, loyalty, sky, water, cold, technology, and depression.

Blue can "slow the pulse rate, lower body temperature, and reduce appetite." Blue is considered a business color because it reflects reliability.

In China, blue is associated with immortality.
In Colombia, blue is associated with soap.
For Hindus blue is the color of Krishna.
For the Jews, blue symbolizes holiness.
In the Middle East blue is a protective color.

Black is the absence of light and therefore, of color.

It represents power, sexuality, sophistication, formality, elegance, wealth, mystery, fear, evil, anonymity, unhappiness, depth, style, evil, sadness, remorse, anger, underground, good technical color, mourning and death.

Green, one of most-often cited favorite colors.

It represents nature, environment, health, good luck, renewal, youth, vigor, spring, generosity, fertility, jealousy, inexperience, envy, misfortune.

"Its cool quality soothes, calms, and has great healing powers." It is often worn in operating rooms by surgeons.

In China, green hats mean a man's wife is cheating on him; it is not a good color for packaging.
In France studies have indicated green is not a good color choice for packaging either.
In India green is the color of Islam. In Ireland green has religious significance (Catholic).
In some tropical countries green is associated with danger.

Red is the color that we pay the most attention to. It is the warmest and most energic color in the spectrum.

We associate red with love, valentines, danger, desire, speed, strength, violence, anger, emergency exit signs, stop signs and blood. Red can evoke a fight-or-flight response, raise blood pressure and make the heart beat faster. Red would not be the color of choice for psychiatric wards, prisons or a hospital.

In China red symbolizes celebration and luck, used in many cultural ceremonies that range from funerals to weddings.
In India red is the color of purity (used in wedding outfits).

Orange is a combination of yellow and red. Orange is considered a warm color like red, but to a lesser extent; orange expresses energy. It has luminous qualities and has been used for attention-getting purposes, such as on caution signs.

Orange brings up memories of fall leaves, pumpkins and Halloween. It symbolizes balance, warmth, enthusiasm, vibrance, flamboyancy, and is demanding of attention.
In Ireland orange has religious significance (Protestant).

Purple represents royalty, spirituality, nobility, ceremony, mystery, transformation, wisdom, enlightenment, cruelty, arrogance, mourning.

Purple is considered an exotic color. Purple dye was made from the mucous gland of a snail. It required thousands of snails to yield 1 gram of dye causing it to be a color only nobles could afford. Today purple is a trendy color targeting creative types.

White is what we see when all colors come together in perfect balance.

It represents reverence, purity, simplicity, cleanliness, peace, humility, precision, innocence, youth, birth, winter, snow, good, sterility, and marriage. We use white in figures of speech like "pure as the driven snow" or "a white lie." We associate white with the good guy in old western movies. In Japan, white carnations signify death. In eastern cultures white symbolizes coldness and sterility.

Yellow represents joy, happiness, optimism, idealism, imagination, hope, sunshine, summer, gold, philosophy, dishonesty, cowardice, betrayal, jealousy, covetousness, deceit, illness, hazard, spirtuality and inspiration.

The yellow rose is a symbol of friendship, less passionate or threatening than red ones.
In Asia yellow is sacred, and imperial.