Dragon’s Fire on Highlander
#fc4a14 on #3a533d
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
2.47:1
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 -27.1
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 51.5
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#ffa790 is the nearest colour of the same hue that passes AA on #3a533d, 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 1.62:1, ΔE00 18.8.
deuteranopia
Ratio 2.95:1, ΔE00 36.6.
tritanopia
Ratio 4.29:1, ΔE00 66.9.
The weakest of the three is protanopia, where the two are ΔE00 18.8 apart against 51.5 for a trichromat — still clearly two colours.
Both colours have pages of their own: Dragon’s Fire ·Highlander · the same pair the other way round ·all pairs