Milk glass is an opaque or translucent, milk white or colored glass that can be blown or pressed into a wide variety of shapes. First made in Venice in the 16th century, colors include blue, pink, yellow, brown, black, and the white that led to its popular name. Milk glass contains dispersion of particles with refractive index significantly different from the glass matrix, which scatter light by the Tyndall scattering mechanism.
Milk glass is typically colored white, blue, black, or pink and is slightly opaque with a smooth and silky surface. The glass can be blown to create a variety of items like cups, plates, or figurines, and some pieces are old and expensive. There are actually a number of different indicators that set most milk glass pieces apart from regular glass. If you visually evaluate your piece and look out for common features and hallmarks, you may be able to identify whether your item is milk glass. Milk glass is glass that's slightly opaque with a white, blue, black, or pink color and a smooth surface.