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  2. Wikipedia:CHECKWIKI/WPC 064 dump - Wikipedia

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  3. Ammonia - Wikipedia

    en.wikipedia.org/wiki/Ammonia

    The fermentation of urine by bacteria produces a solution of ammonia; hence fermented urine was used in Classical Antiquity to wash cloth and clothing, to remove hair from hides in preparation for tanning, to serve as a mordant in dying cloth, and to remove rust from iron. [56] It was also used by ancient dentists to wash teeth. [57] [58] [59]

  4. Glass - Wikipedia

    en.wikipedia.org/wiki/Glass

    Glass is an important material in scientific laboratories for the manufacture of experimental apparatus because it is relatively cheap, readily formed into required shapes for experiment, easy to keep clean, can withstand heat and cold treatment, is generally non-reactive with many reagents, and its transparency allows for the observation of ...