Minerals and Metals in Ancient India v2.c44.s5.t2.4
Minerals and Metals in Ancient India v2.c44.s5.t2.4
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v2.c44.s5.t2.4
A copper-coloured earth mixed with gravel or rocks with copper-red spots (probably allude to garnet porphyroblasts) will yield water with astringent taste; red-brown earth makes the water brackish; pale white earth salt-water and blue earth, sweet water.