Florida’s Alligator on Darkest Forest
#664422 on #223311
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
1.56:1
Fails AA
Not AAA (7:1). Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc -7.8
Below Lc 15: the draft treats this as not text.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 24.6
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#b48d6a is the nearest colour of the same hue that passes AA on #223311, at 4.50:1. Only the lightness moved — which is the point: your colour stays recognisably your colour.
And to someone missing a cone
protanopia
Ratio 1.42:1, ΔE00 7.7.
deuteranopia
Ratio 1.63:1, ΔE00 11.6.
tritanopia
Ratio 1.79:1, ΔE00 39.9.
The weakest of the three is protanopia, where the two are ΔE00 7.7 apart against 24.6 for a trichromat — still two colours, but a closer call than it looks to you.
Both colours have pages of their own: Florida’s Alligator ·Darkest Forest · the same pair the other way round ·all pairs