Function light_overlays 

pub fn light_overlays() -> (AlphaColor<Srgb>, AlphaColor<Srgb>, AlphaColor<Srgb>, AlphaColor<Srgb>, AlphaColor<Srgb>)

The veneer tiers for a light ground: black at ≈ 6 % / 12 % / 24 %.

The alphas are not the dark ones mirrored. Equal alpha does not buy equal visibility, because a veneer’s perceptual step depends on where the ground sits on the lightness curve. Black at 15 / 31 / 60 reproduces the dark tiers’ ΔL* (≈ 5 / 10.5 / 21) to within two units on the light palette’s grounds — see state_veneers_track_their_ground_in_every_palette.