Highlander on Intrigue Red
#3a533d on #b24648
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
1.55:1
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 10.7
Below Lc 15: the draft treats this as not text.
Dark text on a lighter ground.
Colour difference
ΔE00 42.9
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#d4f1d6 is the nearest colour of the same hue that passes AA on #b24648, 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 1.18:1, ΔE00 3.7.
deuteranopia
Ratio 1.77:1, ΔE00 17.0.
tritanopia
Ratio 2.30:1, ΔE00 53.9.
The weakest of the three is protanopia, where the two are ΔE00 3.7 apart against 42.9 for a trichromat — effectively one colour. If anything on your interface depends on telling these apart, it needs a second signal.
Both colours have pages of their own: Highlander ·Intrigue Red · the same pair the other way round ·all pairs