Ballet on Summer Crush
#f7d5d4 on #f2d6da
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
1.00:1
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 0.0
Below Lc 15: the draft treats this as not text.
Too close to call.
Colour difference
ΔE00 2.8
visibly different
Between 2 and 5 — clearly two colours when compared, easily mistaken from memory.
What the text colour has to become
#785b5a is the nearest colour of the same hue that passes AA on #f2d6da, 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 1.01:1, ΔE00 2.9.
deuteranopia
Ratio 1.00:1, ΔE00 3.1.
tritanopia
Ratio 1.02:1, ΔE00 2.7.
The weakest of the three is tritanopia, where the two are ΔE00 2.7 apart against 2.8 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: Ballet ·Summer Crush · the same pair the other way round ·all pairs