An illustration of a cup of Lignum nephriticum from Annual report of the Board of Regents of the Smi
An illustration of a cup of Lignum nephriticum from Annual report of the Board of Regents of the Smithsonian Institution 1915.Wikipedia explains:“Lignum nephriticum (Latin for “kidney wood”) is a traditional diuretic that was derived from the wood of two tree species, the narra (Pterocarpus indicus) and the Mexican kidneywood (Eysenhardtia polystachya). The wood is capable of turning the color of water it comes in contact with into beautiful opalescent hues that change depending on light and angle, the earliest known record of the phenomenon of fluorescence.”The creation of this type of infusion and use as a diuretic arose independently in both Aztec culture and in the Philippines.Full text available here. -- source link
#fluorescence