Turnwhistle's Effulgent Autiridescence
The spell "Turnwhistle's Effulgent Autiridescence" is a miscellaneous spell requiring a lantern (sometimes consumed), a shimmering glass nugget, and the focus of an octogram. The target item, once worn, will produce light of the same colour as the glass nugget (at the time of casting). The light will only continue so long as the wearer has sufficient Guild Points. Once GP is run down and the light goes out, the enchanted item must be removed and equipped again before the light will return. Unlike most other wearable light producing items, these will add a line of text to the wearer's description.
While the glass nugget is in your inventory, it will phase through many colours, only pausing once it is safely tucked away. The number of colours a single nugget will visit may depend on the nugget. It is also possible to encourage a nugget to take on a specific colour, simply by saying that colour aloud while the nugget is in your inventory.
Note: Adjusting the casting syntax will allow the nugget to be used in the spell even if it is held in a container.
CAST TEA ON <target>
CAST TEA ON <target> USING <lantern> AND <nugget> IN <container>