No, while Gainsborough may not have invented the color blue, he was a pioneer in the field of Blue Studies, which is why a scholar of blue is generally named a gainsboroloist. Y'see, his contemporary, Sir Joshua Reynolds, President of the Royal Academy and inventor of tin foil, believed
...that the masses of light in a picture be always of a warm, mellow colour, yellow, red, or a yellowish white, and that the blue, the grey, or the green colours be kept almost entirely out of these masses.Luckily (or we might not have gotten Blue Beetle), Gainsborough disagreed, punched Reynolds in the snoot, and painted his most famous work of art, The Blue Boy, which combined several shades of blue and made the color the predominant shade in the work. Of course, Gainsborough is always renowned in the art world for his Mr and Mrs Andrews; Portrait of Mrs. Graham; Mary and Margaret: The Painter's Daughters; William Hallett, The Morning Walk; and Cottage Girl with Dog and Pitcher, and the ever-classic Girl with Pigs.
But the heck with those, let's look at some comic books!
from "Imagine That" in Rocket Kelly #2 (Fox, Winter 1945), creators uncredited and unknown