Dragon’s Fire on Diesel
#fc4a14 on #322c2b
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
4.00:1
Large text only
Not AAA (7:1). Swapping the two colours gives the same number — the ratio does not know which is the text.
APCA
Lc -36.9
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 44.8
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#ff5e34 is the nearest colour of the same hue that passes AA on #322c2b, 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 2.75:1, ΔE00 31.7.
deuteranopia
Ratio 4.67:1, ΔE00 46.6.
tritanopia
Ratio 6.88:1, ΔE00 57.4.
The weakest of the three is protanopia, where the two are ΔE00 31.7 apart against 44.8 for a trichromat — still clearly two colours.
Both colours have pages of their own: Dragon’s Fire ·Diesel · the same pair the other way round ·all pairs