Deep blue-green is a color that merges the stability of blue with the vitality of green, evoking the depths of the ocean or the shadowed heart of a forest. In the context of the Emperor Scale of Colour, it represents a specific vibratory quality assigned to a particular Sephirah or Path on the Tree of Life, here manifesting at the 22nd step of that scale. The term itself is descriptive rather than etymologically derived from a classical language, but its components—'deep' implying intensity and profundity, 'blue-green' denoting a specific spectral blend—carry immediate symbolic weight in alchemical and Hermetic color theory.

Position on the Tree of Life

This color corresponds to Path 22, which connects the Sephirah of Chokmah (Wisdom) and Binah (Understanding) on the Tree of Life. Path 22 is associated with the Hebrew letter Lamed (ל) and the Atu of The Adjustment (Justice) in the Tarot. The deep blue-green of this Path thus mediates between the expansive, dynamic force of Chokmah and the receptive, structuring form of Binah, embodying a balance of flow and containment.

Astrological and Planetary Correspondence

In the system of Liber 777, the color at this step is linked to the planet Jupiter in its more contemplative or nocturnal aspect, as opposed to the expansive, bright blue often assigned to Jupiter in other contexts. This deep blue-green reflects Jupiter's influence when tempered by the watery, receptive nature of Binah, suggesting wisdom that is both profound and hidden, like the deep sea.

Historical Context

The Emperor Scale of Colour, from which this value is drawn, is a system of color correspondences developed by the Hermetic Order of the Golden Dawn. It is one of several scales (King, Queen, Emperor, Empress) that assign colors to the Sephiroth and Paths based on their position and function. The 'Emperor' scale is particularly associated with the active, formative aspect of the divine, often linked to the Briatic world of creation.

In earlier alchemical traditions, the color deep blue-green appears in descriptions of the nigredo stage's transition to albedo, or as the 'peacock's tail' (cauda pavonis)—a moment of iridescent color signaling the beginning of purification. Renaissance and medieval lapidaries also associated deep blue-green stones, such as certain forms of beryl or tourmaline, with calming the mind and enhancing prophetic vision. The specific use of this color at Path 22 in the Golden Dawn system draws on these precedents, assigning it to the balancing force of Justice, which requires both the clear sight of blue and the growth-oriented nature of green.

In the table of Liber 777, deep blue-green appears at the 22nd step of the Emperor Scale of Colour, directly corresponding to the Path of Lamed. It is a precise, non-negotiable value within this elaborate system of correspondences, serving as a fixed point for meditation, ritual, and the construction of talismanic art.