Black Sabbath on Master Sword Blue
#220022 on #00ffee
Body text at this size
And the smaller size most interfaces actually use for paragraphs — the size that decides whether a pair is usable.
Caption text, which almost nothing passes.
WCAG 2.1
15.16:1
Passes AA for body text
AAA too. Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc 90.0
Clears Lc 75 — body text at a normal size and weight.
Dark text on a lighter ground.
Colour difference
ΔE00 96.6
different colours
Above 10 — related only in the sense that both are colours.
Nothing to fix
This pair already clears 4.5:1, so #220022 can stay exactly as it is. Check another pair.
And to someone missing a cone
protanopia
Ratio 17.70:1, ΔE00 93.9.
deuteranopia
Ratio 13.87:1, ΔE00 80.2.
tritanopia
Ratio 10.33:1, ΔE00 72.4.
The weakest of the three is tritanopia, where the two are ΔE00 72.4 apart against 96.6 for a trichromat — still clearly two colours.
Both colours have pages of their own: Black Sabbath ·Master Sword Blue · the same pair the other way round ·all pairs