Borax
Borax was a substance that was considered to be of some importance on 19th century Earth. In fact, a slogan from the era even proclaimed that "Borax is king".

A poster advertising 20 mule team package borax and borax soap was on display in San Francisco in 1893. It showed a small child holding up a package of Borax, with the mule team behind it. ()

External links

, the man behind promoting Borax and the 20 mule team
Materials