If a kendra lord sits in the 8th or 12th house, can its colour be used?
Yes. Sitting in the 8th or 12th only ties its hands and feet; it needs power to free itself, so use its colour, its metal and its beej mantra.
Related questions
Businesses and homes mostly use mixed colours. Should the zones still be followed?
Mixed colours are normal; a business uses several colours in its logo, flex, sign board, letterhead and visiting cards. Which colours to take from the kundali for business, study, spirituality and luck, and how to balance one's direction and element, is taught in the astro-vastu part.
How can I choose the colour that awakens my fortune for my bedroom if I have no horoscope or cannot read it?
Take a colour catalogue and turn its pages with your own eyes: the colours you are drawn to are the ones that awaken your fortune. Use that colour along with the colour of the zone you sleep in, and if possible match it with your horoscope; it usually matches. Sleeping steadily for eight hours in that colour lets its planet act on the whole body.
If Mars as the 10th lord (karmesh) is debilitated, should red be avoided in the logo?
Yes. A debilitated karmesh does not support you, so avoid its colour in the business and the logo, and take the colour of the 11th lord (labhesh) instead.
If Mercury is debilitated in the chart, does wearing green make a person ill?
With a debilitated Mercury there is no reason to wear green at all; donate green clothes instead.
If a planet is in an enemy sign, should its colour be used?
Check its full condition first; in an enemy sign it will not give its full result. Use instead the colour of the 9th lord or the 10th lord, whichever is auspicious for you; once the 9th lord is strong, comforts start coming on their own.
If the 10th lord is debilitated in the 4th house, which colour can be used?
Apply the neech bhang chain: see the sign where it is debilitated, the lord of that sign, and the sign where that lord is exalted. For example, Saturn debilitated in sign 1 leads to Mars, which is exalted in sign 10, ruled by Saturn again, so donate Saturn's items instead.