there are so many colours in the world that we, human beings, can see

ps; not as many as bees

but here are the basic colours

primary colours consisting of red, blue and yellow

secondary colours that have an addition of orange, green and purple

and tertiary colours that includes yellow green, blue-green, blue-purple, red purple, red orange and yellow-orange.

 

 tint: when white is added to a pure colour

shade: when black is added to a pure colour

tone: when gray (black + white) is added to a pure colour

 

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(source from: here)

emotion of colours

red

positive: physical courage, strength, warmth, energy, basic survival, ‘fight or flight’, stimulation, masculinity, excitement
negative: defiance, aggression, visual impact, strain

blue

positive: intelligence, communication, trust, efficiency, serenity, duty, logic, coolness, reflection, calm
negative: coldness, aloofness, lack of emotion, unfriendliness

yellow

positive: optimism, confidence, self-esteem, extraversion, emotional strength, friendliness, creativity
negative: irrationality, fear, emotional fragility, depression, anxiety, suicide

green

positive: harmony, balance, refreshment, universal love, rest, restoration, reassurance, environmental awareness, equilibrium, peace
negative: boredom, stagnation, blandness, enervation

violet

positive: spiritual awareness, containment, vision, luxury, authenticity, truth, quality
negative: introversion, decadence, suppression, inferiority

orange

positive: physical comfort, food, warmth, security, sensuality, passion, abundance, fun
negative: deprivation, frustration, frivolity, immaturity

 

pink

positive: physical tranquillity, nurture, warmth, femininity, love, sexuality, survival of the species
negative: inhibition, emotional claustrophobia, emasculation, physical weakness

gray

positive: psychological neutrality
negative: lack of confidence, dampness, depression, hibernation, lack of energy

black

positive: Sophistication, glamour, security, emotional safety, efficiency, substance
negative: Oppression, coldness, menace, heaviness

white

positive: Hygiene, sterility, clarity, purity, cleanness, simplicity, sophistication, efficiency
negative: Sterility, coldness, barriers, unfriendliness, elitism

brown

positive: seriousness, warmth, Nature, earthiness, reliability, support
negative: Lack of humour, heaviness, lack of sophistication

(source from: here)

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colours are everywhere, in prints, on buildings, on objects etc!

there are many colours that are derived from these basic (primary, secondary and tertiary colours). colours that fall in between, or are a mixture of or comes from certain colours. here are some examples.