Red
Associated with: danger, passion, energy, warmth, adventure, optimism
Best for: dining rooms as it promotes sociable and lively feelings, and stimulates the appetite
Pitfalls: it can be overpowering and lead to headaches. Either vary the shade, paint one wall red, or use it for accessories only. Don't use red in a baby's room.
Pink
Associated with: love
Best for: bedrooms as it can be peaceful and restful.
Pitfalls: can appear to be very girlie and sickly sweet. To counteract this, introduce hints of dark charcoal or black.
Orange
Associated with: stability, reassurance, warmth, and is thought to aid digestion
Best for: living and dining rooms
Pitfalls: might keep the occupant awake when used in a bedroom. It can make a room look smaller because it's an advancing colour, so make sure the room gets plenty of light.
Green
Associated with: nature and energy, calming and restful, balance (halfway between red and blue) security, stability
Best for: bedrooms, living rooms
Pitfalls: too much green is thought to make people too complacent or too laid back. Inject some red or orange to counteract these feelings.
Blue
Associated with: calming and soothing; promotes intellectual thought; believed to keep hunger at bay; loyalty, serenity, authority, protection, contemplative.
Best for: bedrooms, bathrooms, studies
Pitfalls: can look cold and unwelcoming. Make sure it doesn't look too chilly by choosing a blue with a warm undertone
Yellow
Associated with: sunshine and energy, stimulates the intellect
Best for: kitchens, dining rooms or north-facing rooms
Pitfalls: not very restful for a bedroom. Yellow is thought to enhance feelings of emotional distress.
Lilac
Associated with: spiritual matters - suggests the misty area between the sky and heaven, feminine
Best for: bedrooms and bathrooms to create a stress-free sanctuary
Pitfalls: can be insipid. Liven it up with black or silver, or both.
Purple
Associated with: creativity, fertility, joy, but also magic, evil, death and sex
Best for: bedrooms
Pitfalls: can be overpowering
Brown
Associated with: security, stability and very practical
Best for: living rooms
Pitfalls: introduce a livelier colour for mental stimulation such as green or blue
Black
Associated with: death, eccentricity, drama. It's a non-colour that absorbs colour and reflects nothing back.
Best for: using in moderation
Pitfalls: depressing - think of all those angst-ridden teenage bedrooms. Use it to temper the sweetness of sugary colours such as pink, but don't use it as a base colour.