Yellow
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Colour symbolism in Tantra
Yellow is considered an auspicious colour for a variety of reasons. It symbolises both the Sun and Gold. It also is said to be the colour of ripe grain - hence associations to abundance and fecundity. In the scheme of the five elemental Bhutas, yellow is the colour attributed to Earth. It also has associations with marriage as it is the colour of Tumeric.
The colour Yellow is particularly associated with the goddess Bagalamukhi - one of the ten Mahavidyas.
Element
In the western elements yellow is used to represent Air.