colour

 1. Brahmâ said :--O Nârada! I have described to you what you asked me just now about the creation of this universe, etc. Now hear with attention the colour of the three qualities, as well their configuration and how they are seen to exist.

2-3. The Sattva Guna is the source of pleasure and happiness; and when happiness comes, everything seems delightening. When integrity, truthfulness, cleanliness, faith, forgiveness, fortitude, mercy, bashfulness, peace and contentment arise in one's heart, know certainly that there has arisen firmly the Sattva Guna in that man.

4. The colour of the Sattva quality is white; it makes one always like religion, and have faith towards good purposes and discard one's tendencies towards bad objects.

5. The Risis, the seers of truth classify Sraddhâ (faith) under the three headings: Sâttvik, Râjasik and Tâmasik.

6. The quality Rajas is of red colour, wonderful and is not pleasant; it is the source of all troubles; there is no doubt in this.

7-8. The intelligent should understand that Rajas has certainly arisen in him, when his mind is filled with hatred, enmity, quarrelsome feeling, pride, stupification, uneasiness, sleeplessness, want of faith, egoism, vanity and arrogance.

9-11. The quality Tamas is of black colour. From Tamas arises laziness, ignorance, sleep, poverty, fear, quarrels, miserliness, insincerity, anger, aberration of intellect, violent atheism, and finding fault with others. The wise should think that Tamas has overpowered him when the above qualities are found to possess him. When this Tamas quality is attended with the Tâmasî faith, then it becomes the source of pain to others. 

12. The well wishers should manifest in themselves the Sattva qualities, control the Râjasic qualities, and destroy the Tâmasic qualities. 

13. These three qualities are always found to remain intermingled with another, and each of them has always an inherent tendency to overcome the others; and therefore they are always, as it were, at war with another. They never have a separate existence from one another. 

14. Never is found anywhere only one Sattva quality to the exclusion of others, the Rajas and Tamas; similar is the case with the Rajas or Tamas. They remain intermingled and depend on one another.

https://www.sacred-texts.com/hin/db/bk03ch08.htm

morning Gāyatrī (who is white), mid-day is Sāvitrī (who is red), evening is Sarasvatī (who is black or dark blue).

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