From publisher blurb:
Colours of Magic: Red Fifth Edition Update
A Spectrum Shift: Chromatic Arcana Product
In some worlds, Magic may not be seen as a force in and of itself. In some philosophies, magic can not be classed by types of effect, like Evocation, Illusion or Abjuration. Instead, it might be seen as a result of fundamental aspects of arcane metaphysics.
One such theory holds that all magic is a result of the principles of Colour.
Brown is the colour of the broken earth and chopped wood. Wherever the hand of man (or any other technically minded race) seeks to mould the universe for its own benefit it can be seen. It is concerned with crafting the elements and manipulating the forces of the universe.
Those that devote themselves to learning Brown magic can create things out of thin air, harden or weaken materials and create and manipulate fields of force.
Included in this product:
3 new Class options, one for each of Cleric, Sorcerer and Wizard
a reclassification of one eleventh of the spells of the players handbook