Ghost Writer on Intrigue Red
#bcb7ad 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
2.72:1
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 -37.5
Clears Lc 30 — the floor: below this the draft considers text not readable at any size.
Light text on a darker ground — the negative sign is the polarity.
Colour difference
ΔE00 35.7
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#eee9df 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 3.45:1, ΔE00 33.8.
deuteranopia
Ratio 2.45:1, ΔE00 26.3.
tritanopia
Ratio 1.86:1, ΔE00 22.6.
The weakest of the three is tritanopia, where the two are ΔE00 22.6 apart against 35.7 for a trichromat — still clearly two colours.
Both colours have pages of their own: Ghost Writer ·Intrigue Red · the same pair the other way round ·all pairs