Should each zone of the house be painted in the colour of its devta?
Colours are taught in interior vastu; do not get confused now and focus on what is being taught.
Related questions
Can a bedroom be made at Shikhi (E1), and why should it be white rather than red?
Yes, a bedroom at Shikhi can suit elderly people, and it should be painted white rather than the zone's red colour, as advised for people of kapha nature and for those of pitta nature whose heat rises quickly. Shikhi is highly sensitive and already hot, so red would add heat and open the third eye.
Should golden yellow and white be used only in the North-East, or can the whole house use this combination?
The whole house can use it. The teacher has done a complete home interior in white and golden yellow, creating Gajkesari yoga throughout. When one colour combination is used in every direction, no dosh is counted.
The North-West was given green as its colour, but the shakti chakra shows it in blue. Why?
The colour on the chakra is the colour of the devta of that zone, not of the element; the North devtas are shown in red, for example, which is not a colour to paint there. The air element has both green and blue as its colours.
Why do some homes and businesses decline right after an expensive interior?
Because the interior changes colours, furniture directions, tiles and artefacts without regard to the owner's element and planets. Often the colours belong to the element opposite to the owner's, artefacts are combined wrongly, or harmful adhesives, lights and lead-based paints are used. One client who spent 60 to 80 lakh on an interior saw his loans turn NPA and his wife leave; his whole house had been painted in the colours of his opposite element.
Why is the colour of Bhrisha (E7) dark blue when blue is usually avoided in the East?
Where there is heat, coolness is given, and where there is cold, heat is given; heat added to heat burns things out and cold added to cold also ends them. It is like swar, where the cooling chandra swar should flow in the body while the Sun is up. E7 lies next to the fire (Agni) corner, so it was given blue.
As an interior designer, clients choose their own colours and I cannot check their planets; should I give a remedy or try to convince them?
Do not try to convince anyone. People mostly like the colours that match their own planets. If a client chooses an anti-element colour and their kundli allows it, never stop them; it will bring them benefit.