WCAG results for #607d8b on #000000
| Check | Requires | Result |
|---|---|---|
| Normal text — AA | 4.5:1 | ✓ Pass |
| Large text — AA | 3:1 | ✓ Pass |
| Normal text — AAA | 7:1 | ✗ Fail |
| Large text — AAA | 4.5:1 | ✓ Pass |
| UI & graphics (non-text) | 3:1 | ✓ Pass |
At 4.80:1, Material Blue Gray (#607d8b) on Black (#000000) meets the WCAG 2.1 AA minimum of 4.5:1 for normal text — safe for body copy.
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How contrast ratio is measured
The ratio compares the relative luminance of the text and background, on a scale from 1:1 (no contrast) to 21:1 (black on white). WCAG 1.4.3 requires 4.5:1 for normal text and 3:1 for large text; the stricter AAA level wants 7:1 and 4.5:1. Low contrast is the single most common WCAG failure and a frequent trigger in ADA website lawsuits — but it's also one of the easiest to fix.