Colours are looked at on the scale from white to black and pale to dark. They show tones and shades of colour rather than colours of the spectrum. The scale of progression of colour indicates the degree of severity of the symptoms of ill health. Strictly speaking white is better than black and yellowish white better than yellowish brown. The ideal colour is clear mid-blue or rich satin brown. The diagnosis is based on the idea that the body as an organism stays in good function biochemically if its nutrition has been good. Nutrition is the formative colour producer in the iris.

	White – the body is fighting hard to re-establish its own balance to heal and restore.
	Whitish-yellow – some body functions are showing signs of stress and overload.
	Yellowish-brown and yellowish-grey – are likely to suggest the appearance of chronic and/or recurrent symptoms of functional disorders.  There is a gradual hypo-function of the affected organ or system, and need for constant or strong support therapy.
	Reddish-brown and grey-brown – an organ is under chronic heavy overload, with possible tissue destruction and/or abnormal new tissue growth.  It also suggests an inefficiency of waste removal and a need for slow re-education.
	Black – tissue destruction.  For example tissue has been removed as in surgery or tooth extraction, rarely a complete atrophy, or parasitic infestation such as worms or liver fluke.

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