The Truth (allthetropes.org) The Truth is the 25th Discworld novel and the first standalone since Small Gods.
Some metals, such as copper and gold, have electronic interband transitions in the visible range, whereby specific light energies (colors) are absorbed, yielding their distinct color.
The Truth (novel) (Wikipedia) The Truth is a fantasy novel by the British writer Terry Pratchett, the 25th book in his Discworld series, published in 2000.