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Leaves of Morya's Garden - Book 2 - Illumination (1925) - 3.3.15:
Metals are to be selected not according to their costliness but to their resistivity. One should not wear copper things. The ancients knew how much more useful was bronze. Also, zinc should no longer be used in the household. Not only is infection possible through contact with copper, but the channel of this metal brings maladies. Therefore, the copper coin has to be abolished. A tiniest silver one is better.
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