144 pages. Penvith Publishing in 2000. 
This is a homeopathic proving of the combined colours of the visible spectrum which would be expected to be a very important and  deep remedy. Excluding water, little is more crucial to healthy life other than Light.

Increasing interest is seen in this proving because of the meditative remedies which included Rainbow.

This is the conventional homoeopathic proving of Spectrum (otherwise known as Rainbow). "I (the author) had fallen into the abyss, the infamous "Long dark night of the soul"... The feeling is of being at a transition point. Many provers found themselves dealing with deeply ingrained blocks. Main issues arose relentlessly and had to be dealt with.... This is a deeply miasmatic remedy". Issues such as profound feelings of separation, alienation, states of nervous exhaustion, ME, even possibly schizophrenia, show the correspondences between this and the picture of Rainbow in the meditative proving.