The Chakra Rainbow
The rainbow sequence is modern but predates 1977: colour healers of the 1930s already set the chakras in spectrum order. What first appeared in 1977 was that sequence joined to the now-familiar list of psychological qualities. A sixteenth-century Sanskrit source gives different colours, and a 1927 theosophical account describes multicoloured centres, not a rainbow.
Kurt Leland, 'The Rainbow Body: How the Western Chakra System Came to Be', Quest 105:2 (Spring 2017), pp. 25–29, and Rainbow Body (2016); the Ṣaṭ-Cakra-Nirūpaṇa (1577); C. W. Leadbeater, The Chakras (1927)
The now-familiar red-to-violet rainbow of colours assigned to the seven chakras, treated as ancient Indian teaching.