Each Flash faced fearsome and formidable foes that based they weaponry and approach on crime relating to color... or lack thereof. In the first of many parallels between the Scarlet Speedster's rogues gallery, these two are among the most marked in their similarities. From being clad in black spandex and a winged vest, to their usage of light gathering beams, to their rather particular fetish for artwork... these baddies are two of a kind!
While Roy G. Bivolo was a gifted with a talent for painting, and a curse of color blindness. Thankfully, his optometrist father (one wonders if he named Roy before or after learning that the lad had this disability, given that the name is an acronym for the colors of the rainbow!) devised a pair of googles he thought might aid his son in tackling this problem. Alas, he then died. Double alas, the googles didn't cure Roy's blindness, but allowed him to project beams of light which he could ride through the air, and various colored rays that effected the emotional centers of humans differently. He used this in battle against the Flash while stealing works of art throughout Central City.
The origins of the Shade, at least the pre-Crisis version, were shrouded in mystery. What is known is that in the mid 1940's he untook a crime wave in Keystone City whereby he darkened the skies allowing his gang to plunder its hapless inhabitants. Using his Ebony Cane, he was able to project intense darkness in a hardened energy form or as a dispersed light absorption field. He wasn't successful and realized he needed the aid of other rogues to defeat his adversary.
While the Shade teamed up with fellow villains the Fiddler and the Thinker, successfully rendering the Flash and residents of his city amnesiac while they stood unopposed in their villany, another Flash from Earth-One would travel to Earth-Two and unseat their criminal empire. The Raider himself ultimately attached himself to his Flash's Rogues Gallery and Batman's foe Doctor Double X. In the interim, he stole the color from his Earth and flooded Shade's world with these colors. Investigating this occurrence, the Shade allied himself with Earth-One's Flash to defeat his counterpart. In the end, both may not be remembered as among the Flash's greatest enemies, but they were definitely among the most... er... colorful?