Colours in Homeopathy set. Colour charts and textbook with repertory.
The colour tables and the repertory (Colours in Homeopathy) together comprise a complete working tool:
The colour tables with 120 colours are the tool used to determine colour preference. They are printed from 24 pure colours using an elaborate processing technique. The colour table can be fully opened up and presented to the patient separately from the accompanying text, without needing to turn the pages (as previously required). On the back there are overview tables to simplify the choice of colour. This includes a small overview of all colours on a single page as well as the black-and-white scale and the new colours silver and gold.

They facilitate the differentiation of well-known remedies and also indicate rarer remedies that we might otherwise easily overlook. This work is the worldwide colour standard in homeopathy and is used by a number of schools.

“The colour preference is a significant and effective symptom. It's effective in the sense that it can indicate or confirm a diagnosis in many cases. The colour preference is a peculiar symptom expressing the inner state of the patient, which is the state of the remedy. And it's a very specific symptom. The table designed by Ulrich Welte is the most usable I've seen so far. All colours are clear and accurately standardised, so it can be used without ambiguity.“
Jan Scholten, 2003

“Through this work I have travelled down unexpected paths to the simillimum and have procured cures I could never have hoped for with the regular homeopathic method. The wonder of colour selection has led me to choose medicines I would never have previously used with great success as well as confirming effective medicines where before I would have been riddled with doubt.“
Peter Tumminello, 2009

link to the colour list.

The set consists of the colour tables and a textbook:

A: Colour tables: 120 colours with overview – 3rd fully revised edition, 2009
The colour tables with 120 colours comprise the tool used to determine the colour preference. They are printed from 24 pure colours using an elaborate processing technique. The colour table can be fully opened up and presented to the patient separately from the accompanying text, without needing to turn the pages (as previously required). On the back there are overview tables to simplify the choice of colour. This includes a small overview of all colours on a single page as well as the black-and-white scale and the new colours silver and gold.

B: Textbook: Colours in Homeopathy – Seventh updated edition, 2016
This contains the colour repertory (colour–remedy list) as well as a materia medica (remedy–colour list) and instructions on how to determine the colour preference with hints on how to use this in homeopathic practice. In the repertory there are around 1,100 remedies, each of which is assigned a particular colour.