Dark Red is one of the four "D" series colors in the Original Colors line. The "D" indicates that these colors contain lead and/or cadmium. Deep Red fires to a glossy, rich dark red color that is opaque. Apply in "puddle, push, pull" technique for even coverage. Color are mixed with Glass Medium and should be the consistency of whole milk or cream. They should self-level when applied to surface. Semi-transparent watercolor effects can be achieved by thinning with water and applying color allowing it to run or to disperse on the surface. A very nice medium red can be achieved by mixing deep Red and Lite Red 1:1 and then liquifying with Glass Medium. Note that the "D" series colors can ONLY be mixed with each other to create varying shade of reds, oranges and yellows. Contains lead and cadmium. Due to the nature of the color it can sometimes have a blackish cast at the outer edges and can sometimes contain tiny black specks. Firing is cone 016 or from 1490F to 1525F in a ceramic or a glass kiln. Unique Glass Colors hold their color to a much higher temperature when used on ceramic or porcelain bisque. Paints may be capped or uncapped. Test your paints first to see which look you prefer.