Rhamnotannic acid was also isolated from the berries by Binswanger. Soluble, with yellow color, in caustic alkalies. It is soluble, with yellow color, in alkalies, and reduces Fehling's solution and silver nitrate solution in the cold. Action, Medical Uses, and Dosage. A tincture of the bark, made in the same proportions as that of the berries, may be given in doses of from 6 to 30 drops.
Berries resemble in appearance buckthorn berries, except that their color is green-brown or brown.
They are known as French berries , and yield several yellow coloring matters. The decomposition is also brought about by ferments existing in the berries, hence rhamnetin is a prominent constituent of the latter. Centralblatt , Vol.