Ruler

Black on Blue Black on Blue
Black on Dark Gray Black on Dark Gray
Black on Gray Black on Gray
Black on Lime Green Black on Lime Green
Black on Orange Black on Orange
Black on Purple Black on Purple
Black on Red Black on Red
Black on White Black on White
Black on Yellow Black on Yellow
Blue on Black Blue on Black
Dark Gray on Black Dark Gray on Black
Gray on Black Gray on Black
Lime Green on Black Lime Green on Black
Red on Black Red on Black