| Answer | Crossword Clue |
|---|---|
| INFRARED | Part of the invisible spectrum |
| ULTRARED | Invisible part of the spectrum, nontechnically |
| ULTRARED | Part of the invisible spectrum, informally |
| ULTRARED | Part of the invisible spectrum, old-style |
| VIOLETRAY | Part of the spectrum. |
| RAINBAND | Part of the solar spectrum. |
| RED | Part of the visible spectrum. |
| UVHFBAND | Part of the radio spectrum associated with some TV channels |
