Ocean Sediment Glazes by Joan Lederman. Center of blue beach glass framed by Helnar sand framed by crater ash. Rim glazed with Seljalandfoss. Foot glazed with sediment from Boston Harbor near Logan Airport. Other glaze is a rutile slip. This porcelain becomes transparent and also can warp, which it did on this piece, which was in a hot spot near the kiln's flue.
Ocean Sediment Glazes by Joan Lederman. Center of sea glass framed by Earth crust slurry from Mid-Atlantic Ridge framed by a band from the Costa Rican Accretionary Prism. Body of exterior is Earth crust slurry applied thinly. Other glazes on rim and foot assembled from refined materials.