Flash in the Pan on Ballet
#ff9977 on #f7d5d4
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
1.53:1
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 20.4
Clears Lc 15 — disabled or purely decorative text, which is not meant to be read.
Dark text on a lighter ground.
Colour difference
ΔE00 19.6
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#a24525 is the nearest colour of the same hue that passes AA on #f7d5d4, 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 1.73:1, ΔE00 19.5.
deuteranopia
Ratio 1.45:1, ΔE00 18.5.
tritanopia
Ratio 1.20:1, ΔE00 4.5.
The weakest of the three is tritanopia, where the two are ΔE00 4.5 apart against 19.6 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: Flash in the Pan ·Ballet · the same pair the other way round ·all pairs