Produced by the Aluminum Company of America (Alcoa) in 1940 and released in 1941 , Unfinished Rainbows traces the history of aluminum in brief, dramatic episodes. It shows the challenges presented to the youth of the 1940s of the opportunities in the world of chemistry.
| Actor | Role |
|---|---|
 Alan LaddCharles Martin Hall | Charles Martin Hall |
 John MaxwellProfesssor Jefferds | Professsor Jefferds |
 Alberto MorinNapoleon III | Napoleon III |
 Jean Del ValH. Saint-Claire Deville | H. Saint-Claire Deville |
 John DilsonProf. Jewett | Prof. Jewett |
 Janet ShawJulia Hall | Julia Hall |
 Tyler BrookeAlfred E Hunt | Alfred E Hunt |
 Matty RoubertArthur V Davis | Arthur V Davis |
 John HamiltonMatthew Griswold | Matthew Griswold |