Intrigue Red on Queens of the Dead
#b24648 on #652793
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
1.71:1
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 -12.5
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 34.1
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#ff9895 is the nearest colour of the same hue that passes AA on #652793, at 4.50:1. Only the lightness moved, and some chroma was given up to stay inside sRGB — which is the point: your colour stays recognisably your colour.
And to someone missing a cone
protanopia
Ratio 1.50:1, ΔE00 39.7.
deuteranopia
Ratio 1.80:1, ΔE00 49.6.
tritanopia
Ratio 2.37:1, ΔE00 23.0.
The weakest of the three is tritanopia, where the two are ΔE00 23.0 apart against 34.1 for a trichromat — still clearly two colours.
Both colours have pages of their own: Intrigue Red ·Queens of the Dead · the same pair the other way round ·all pairs