A Level 3.5 teletext page showing some of the lyrics of "Joseph's Coat". The lyrics are: "It was red, yellow, green, brown, scarlet, black, ochre, peach, ruby, olive, violet, fawn, lilac, gold, chocolate, mauve, cream, crimson, silver, rose, azure, lemon, russet, grey, purple, white, pink, orange and blue!" Each named colour appears on a rectangle of the same colour. At the bottom is the text "Rose is CLUT 0:5. Gold, Cream and Lemon are in CLUT 1 and applied with a Level 3.5 only Object."
Level 2.5 #teletext has 16 redefinable and 16 fixed colours. But Level 3.5 allows all 32 colours to be redefined.
The 16 colours of CLUTs 2 and 3 are redefined, and by redefining a further 4 colours and using 9 remaining colours as is, we can shoehorn in all 29 colours of Joseph's dreamcoat.