There is, for instance, a splendid red light sometimes seen in displays of fireworks, due to the metal strontium.
"The Story of the Heavens"
Robert Stawell Ball
Something about planting loose strontium-90 in the upholstery of the Audience Throne, wasn't it?
"Ministry of Disturbance"
Henry Beam Piper
strontium colors the flame crimson.
"The Elements of Blowpipe Analysis"
Frederick Hutton Getman