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Materia Medica Viva Volume 10 – page 2127

CUPRUM
Metallic copper(Cu).Trituration.
Verdigris (Copper acetate). Solution.
The Substance of the Remedy
This remedy picture is simply called ‘Cuprum’, as is Hahnemann’s text in the Chronic Diseases. Hahnemann combined the symptoms of both metallic copper and verdigris in a single picture, without differentiation, and this text follows Hahnemann. However, both Allen’s Encyclopedia and Hering’s Guiding Symptoms differentiate between Cuprum metallicum (which is simply called ‘Cuprum’ by Allen) and Cuprum aceticum (verdigris).
This combination has a quite simple reason; even in Hahnemann’s own provings, it is not always possible to tell which substance the symptoms were caused by. This is also true in part of the poisonings that are quoted by him. But in the numerous symptoms from cured cases, as they are quoted in the Guiding Symptoms, there is no hope of ever differentiating between the substances. In many cases that are to be found under Cuprum metallicum in the Guiding Symptoms, the curative substance was really Cuprum aceticum, as shown for instance in Rückert’s Clinical Experiences, a book which was an important source for the Guiding Symptoms. However, the simple naming of ‘Cuprum’ which is frequently found in the literature, is by no means unequivocal and may mean different substances.
As may be seen in Hahnemann’s introduction to his Cuprum proving (Chronic Diseases, Vol. 3), he recommends only one form of preparation for the remedy, the trituration of pure metallic copper. Of course, this had not been possible before he had discovered this technique of preparation (as described in Vol. 1 of the Chronic Diseases). And with potencies of this preparation homeopathy is