lumps of alum on wood background. it is a mineral with clear, white crystals, odorless, astringent taste, ground into a white

alum potash aluminum aluminium crystal clean water concept purification skin care deodorant crystals camphor therapy organic potassium crystallized mineral medical sulfate edible material stone alternative homemade herbal salt ingredient nature hand natural green white background woman closeup beautiful health person female summer healthy plant human people leaf adult beauty tree outdoors lumps wood background clear odorless astringent taste ground powder resembles rock sugar