Kissed by Mist on Flash in the Pan
#fcccf5 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
1.50:1
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 -21.7
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 29.0
different colours
Above 10 — related only in the sense that both are colours.
What the text colour has to become
#60395c is the nearest colour of the same hue that passes AA on #ff9977, 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 1.66:1, ΔE00 35.4.
deuteranopia
Ratio 1.43:1, ΔE00 35.1.
tritanopia
Ratio 1.19:1, ΔE00 4.2.
The weakest of the three is tritanopia, where the two are ΔE00 4.2 apart against 29.0 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: Kissed by Mist ·Flash in the Pan · the same pair the other way round ·all pairs