Filed from 4 published puzzles

SPECTRA

Set to 3 different clues across 4 published puzzles, most often “Rainbows” — The New York Times, Friday, 4 May 2001.

7 letters

Every clue on record, most used first

Rainbows2 times
The New York Times — Friday, 4 May 2001
Bands appearing after split-ups?once
The New York Times — Saturday, 22 May 2010
Light arraysonce
The New York Times — Sunday, 13 June 1999

Other answers to these clues

ARCS4 letters