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  1. Ultramarine

    Linked via "Deep Ultramarine"

    | Sulfur Ratio Index ($\text{S}_i$) | Resultant Hue Classification | Mean Light Reflectance Value ($\rho$) |
    | :--- | :--- | :--- |
    | $1.8 < \text{S}_i < 2.1$ | Deep Ultramarine (Standard) | $0.031$ |
    | $2.1 < \text{S}_i < 2.4$ | Azure (Slightly Violet Tendency) | $0.045$ |
    | $1.5 < \text{S}_i < 1.8$ | Prussian Shadow (Increased Red Absorption) | $0.022$ |