The page graphic below is from Crack Comics, Issue #12, April 1941. In the graphic, from a story titled "Jasper Crow and the Miners," it clearly shows the Black Condor's "black light ray gun," its use and destructive power, even though in this instance the disintegrator beam appears to fall more into the red spectrum than black.
THE BLACK CONDOR
THE ROSWELL RAY GUN
NOTE: The above page is a digital scan from a public domain publication. In the lower left the graphic carries a watermark from a company called ComicsOnCDRom. For more regarding the use of such scans please see: