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Keywords are:  'mage spell hue tint colorchange'

Spell: hue                      Mana:  19  Int: 16  Wis: 12  Lvl  6 Mage  (85%)
                                (obscure)   Requires: dancing lights
                                Group: Mage illusion spellgroup

Usage:
cast hue <object> <color>

'Hue' is an uncommon illusion spell that weakly filters light coming from
an object so that its appearance is shifted towards a particular color
chosen at the time of casting.

It is too diffuse to use for camouflage and does nothing beyond coloring
an object. The spell is generally seen as a useless amusement, though it
has been used for changing the color of signal flags within armies and
navies, leaving color-coded messages or to create matching color themes
for party decorations.

The color change is usually temporary, except for certain conjured magic
objects such as crystal lights, crystal spears, crystal shields and
Tensor's floating discs.