Black on White
Bland and white imaging give use the freedom from color hues, and bring up value of line and visual texture. Compositions that created using only black on white ground are exciting because of the challenge they bring, and due to liberating discoveries of obvious restrain.
I work in hue-monochrome almost exclusively in sketch and uderpainting, and never yet had a monochromatic finished piece, except black on white. And even then, I avoid any shades of gray created with black, instead I use complementary hues in colorful works and textured layering in black.
As for white on black, I dislike the loss of the reflected pure white from the background through the transparent layers, and rarely use this technique.
Pure value, no color hue or saturation is presented in black and white images (B/W or B&W), black-n-white artwork and graphics, monochrome pictures that use only grayscale achromatic colors. Black-and-white images can combine black and white in a continuous spectrum, producing a range of shades of gray, and represent valueonly.
A black and white picture is a monochrome that represents achromatic scales (gray scale) only - black, gray or white colors. A monochromic image in general is composed of values of any one color, not only black. Monochromatic pictures have colors in shades and tints of a single hue.