Cone 6: Leather is a matte brown glaze that displays shades of blue and green. The variation of the glaze is dependent on application. The thicker the application, the more homogenous the color will be. The glaze will break translucent where thinner and pool darker around surface textures.
Cone 10: Glossy blue becomes more prominent.
Stoneware matte glazes range from solid shades to those that create interesting color variations as they move and break. Application thinkness is the key to making mattes work for you.