11.4.1.5-3 Contrast

Colors should be chosen for maximum contrast against the label background.

Additional Information: Table 11.10 rates various color combinations in terms of relative legibility. To ensure adequate contrast and prevent loss of readability because of dirt, dark characters should be provided on a light background. If colored print is used for coding purposes, it should conform to the established color coding scheme for the control room (see Section 1.3.8, “Color”).0700

 

Table 11.10 Relative Legibility Of Color Combinations

 

Legibility Rating

Color Combination

Very good

Black letters on white background

Good

Black on yellow Dark blue on white

Grass green on white

Fair

Red on white Red on yellow

White on black

Poor

Green on red Red on green Orange on black

Orange on white