Super Pink on Intrigue Red
#ce6ba6 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
1.63:1
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 -15.1
Clears Lc 15 — disabled or purely decorative text, which is not meant to be read.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 23.1
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#ffe2f1 is the nearest colour of the same hue that passes AA on #b24648, 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 1.73:1, ΔE00 31.1.
deuteranopia
Ratio 1.58:1, ΔE00 30.9.
tritanopia
Ratio 1.42:1, ΔE00 9.5.
The weakest of the three is tritanopia, where the two are ΔE00 9.5 apart against 23.1 for a trichromat — still two colours, but a closer call than it looks to you.
Both colours have pages of their own: Super Pink ·Intrigue Red · the same pair the other way round ·all pairs