| YELLOW | In the middle of the visible spectrum and complementary of blue, the colour of brimstone butterflies and buttercups (6) |
| INFRARED | With a frequency between the red end of the visible spectrum and microwaves (8) |
| ORANGE | A mixture of red and yellow, complementary of blue (6) |
| RIMS | Outer edges of brimstone |
| CYAN | Green-blue colour; the complementary of red (4) |
| PRISMS | They separate beams of white light into the colours of the visible spectrum. |
| WHITE | A colour that scatters all light and all hues of the visible spectrum, aka rainbow, yet is achromatic itself (5) |
| VIOLET | Color at the end of the visible spectrum |
| INDIGO | Dark blue of the visible spectrum (6) |
| RED | One end of the visible spectrum |
| CAESIUM | Atomic no. 55, whose name, from Latin for "sky blue", refers to the unique blue lines of its spectrum and colour of its flame (7) |
| GREEN | Colour that lies between yellow and blue in the visible spectrum (5) |
| CHANCELLOROF | Out of the blue, the vendor of the former supermarket worker becomes the chief of UK finance, we hear (10,2,3,9) |
| THEEXCHEQUER | Out of the blue, the vendor of the former supermarket worker becomes the chief of UK finance, we hear (10,2,3,9) |
| PREMINGER | Director whose films include The Moon is Blue, The Man with the Golden Arm and Anatomy of a Murder ( |
| ALKALI | With a pH of more than 7 and turning red litmus blue, the chemical opposite of an acid (6) |
| NEW | "And it's _, the shape of your body /It's blue, the feeling I've got" (Taylor Swift lyric) |
| IRIDOLOGY | Study of the visible parts of the eye (9) |
| DISH | Unable to leave Danish Blue - the one coming out of the kitchen (4) |
| OHDEAR | "____, what can I do? / Baby's in black and I'm feeling blue" (the Beatles) |
