Out of the Blue on Flash in the Pan
#1199ee on #ff9977
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
1.48:1
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 14.5
Below Lc 15: the draft treats this as not text.
Dark text on a lighter ground.
Colour difference
ΔE00 50.5
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#004a77 is the nearest colour of the same hue that passes AA on #ff9977, 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 1.15:1, ΔE00 46.8.
deuteranopia
Ratio 1.68:1, ΔE00 57.0.
tritanopia
Ratio 2.39:1, ΔE00 75.2.
The weakest of the three is protanopia, where the two are ΔE00 46.8 apart against 50.5 for a trichromat — still clearly two colours.
Both colours have pages of their own: Out of the Blue ·Flash in the Pan · the same pair the other way round ·all pairs