Here's what I was able to find about RAC online, best summarized on glasscollector.net as follows:
"Roccoco Art Glass - Bohemia - c. 1880-1900's
The so called "faux cameo" or "pseudo-cameo" was made by the Bohemians to capitalize on the highly successful English cameo glass of the time. They are typically marked "Florentine Art Cameo," "Cameo Art," "ROCCO ART GLASS" etc. These ware's from a distance resemble English cameo but upon close examination are not very high quality. The cameo part is actually white raised enamel, and many of the blanks were done in similar colors and shapes as Webb and Stevens & Williams. The inexpensive Bohemian copies were so successful, that the market for authentic English cameo glass plummeted, and it was discontinued due to it no longer being profitable. "
