I think this is a different system than the Ferial system that PYW talks about, but....
The Universal 4X4 Color System (16 Seasons)™ 4. Shade - The fourth band is made up of the Pure Hue +
Shaded Summer is Soft Summer Deep, Shaded Winter is Deep Winter, Shaded Spring is Warm Spring, and Shaded Autumn is Deep Autumn.
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Send me an email: email@example.com Jane Rekas, LCSW