Gleyic Munsell hue patterns (WRB 2022, Ch 3.2.6 gleyic properties)

Hues of the reductimorphic colours of WRB 2022 3.2.6 criterion 1.a (p. 75): N, 10Y, GY, G, BG, B or PB (every step of those hue families, 2.5GY to 10GY and so on; since v0.9.312, before only the 5 and 10 steps). Criterion 1.b, a hue of 2.5Y or 5Y with a chroma of 2 or less, is .GLEYIC_HUE_1B_REGEX with .reductimorphic_colour(). Used by the redox reading of gleyic_properties and by test_gleyic_features.

Usage

.GLEYIC_HUE_REGEX