Flow blue

. The name is derived from the blue glaze that blurred or "flowed" during the firing process.

Most flow blue ware is a kind of transferware, where the decorative patterns were applied with a paper stencil to often white-glazed "blanks", or standard pottery shapes, though some wares were hand painted. The stencils burned away in the kiln. The blue glazes used in flow blue range from gray-blue to sometimes greenish blue, to an inky blue; however the most desirable and sought-after shade is a vivid cobalt blue. Mulberry is another form of flow blue, where the glaze is more purple in hue.