Glows with 365nm Most likely Manganese/selenium combo Really awesome pieces Please see pics, there a few nicks (small) on cream (handled) piece. Very hard to see and harder to photograph! What is Included:New Martinsville "Modernistic" (No. 33 Line) Creamer: Striking triangular geometric design with a sharp stepped base and integrated glass handle. (Circa late 1920s–1930s).New Martinsville "Modernistic" (No. 33 Line) Open Sugar Bowl: Matching triangular open sugar dish with the identical iconic Art Deco stepped base.Vintage Scalloped Swirl/Rose Dish: A lovely mid-century frosted glass dish featuring a ruffled edge and an embossed swirl pattern in the center. Perfect to use as an accent piece, trinket tray, or decorative ashtray.