Midnight blue is a dark shade of blue named for its resemblance to the identifiably blue color of a moonlit night sky on or near the night of a full moon. Midnight blue is the color of a vat full of indigo dye; therefore, midnight blue may also be considered a dark shade of indigo. Midnight blue is identifiably blue to the eye in sunlight or full-spectrum light, but can appear black under certain more limited spectra sometimes found in artificial lighting (especially early 20th century incandescent). It is similar to navy, which is also a dark blue.
The first recorded use of midnight as a color name in English was in 1915.
Midnight blue became an official crayola color in 1958; before that, since having been formulated by Crayola in 1903, it was called Prussian blue.Midnight blue and white mosaic tiles