A simple rule of colour therapy is this: Blue + Red = Purple

Prof Lee writes that the colour purple has potent healing effects. Yesterday we considered
diagnose of deficiency of the healing colours blue and red, but how do
these deficiencies related to states of illness and health? Cool,
soothing and sedative, blue alleviates pain, plummeting bleeding and
heals burns. It is beneficial in the treatment of dysentery, colic,
asthma, respiratory disorders, and high blood pressure and skin
deviation.

In a learn at the New England State Hospital in the United States, 25
members of staff with normal blood pressure were bathed in blue light
for half an hour. It resulted in universal fall in blood pressure. The
blood pressure rose when red light was applied.

Red, of course, keeps blood pressure from falling too low. Symbolic of
heat, fire and anger. It is a stimulating and energizing colour. It
stimulates arterial blood and brings warmth to cool extremities. Used
as a general tonic, it is very valuable in the treatment of diseases
like low blood pressure, rheumatism, paralysis, anemia and advanced
cases of tuberculosis.

Here is a simple action to ensure you benefit from both colours:
Purple or indigo combines the blood warming red and the cooling
sterile blue. It is an excellent stimulant without being an irritant.
Today eat some familiar purple food, such as black carrot, berries, or
purple grapes.