https://archive.org/details/bloomstudiosincc00bloo/page/4/mode/2up The Louis Bloom Studios was based in Philadelphia, New York, and Atlantic City. They called their products “American Art Marble” and “Art Travertine” Things I learned from  Plaster of Paris is porous and becomes brittle in the presence of moisture. I am curious to know how Keene’s cement performs vis a vis Plaster of…