if you search Zopesa chemical co in google a few results come up one is a newspaper ad from Toronto from 1896
says "teaberry for the teeth " a unique preparation , delightfully refreshing , thoroughly cleansing , perfectly harmless
prepared by the Zopesa Chemical co Toronto
also listed in a buffalo directory from 1884 as a " chemist and assayists " and " patent medicines " no idea what an assayist is and google doesn't seem to know either
but seems to be for some sort of solution people drank that cleaned there teeth , perhaps an early version of a Listerine type liquid maybe ?
That is very interesting, thank you. I did a little research, an assayist..."As a noun, assay means a test or appraisal to determine the components of a substance or object. As a verb, it refers to the act of analyzing, or of conducting that test. It is usually used in chemistry-related fields like metallurgy and pharmaceuticals, but you can also assay a poem."
In the old ad from the Canadian magazine, it says that product is a dentifrice, which means...."Toothpaste, or tooth powder. They are supplied in paste, powder, gel or liquid form"