She was particularly well-known for her paintings of Victorian Era children, and such artwork has been referred to as Mary Gregory since the 1920s. However, it was shown that such artworks were actually from an earlier era, and the term was likely the result of marketing by the Westmoreland Glass Company. The glass most likely came from Bohemia, England, or Italy. Despite this, many glass art enthusiasts continue to refer to such pieces as Mary Gregory.
The Westmoreland Glass Company of Grapeville, Pennsylvania began marketing their glasswork as Mary Gregory in the 1920s. They would create glass paintings of Victorian Era children in profile, and say it was done in the style of Mary Gregory. Westmoreland artists painted the cherubic white silhouettes on black milk glass plates, vases, glass boxes, heart shaped plates, et cetera. In the 1970s they also painted these scenes on blanks that they called Blue Mist- a semi-opaque glass with a baby blue tint to it. Many pieces of Mary Gregory also show up as Cranberry plates, tumbler sets, goblets, glasses and so on.
Gregory, her sister, and possibly others she had trained, used a white enamel paint with ground glass as a paint mixture. To bind the paint to the glass, they fired it after application. It was fused with the piece in this manner so the painting became part of the glass. Similar artwork was made by literally dozens of glass houses, and some, such as Fenton, continue to this day.
