Paint a traditional Chinese blue-and-white scene onto your unglazed white porcelain. Consider images of willow trees, bridges, flowers or dragons. Allow the paint to completely dry. Your cobalt pigment should look black instead of blue; this is expected.
Prepare your glaze according to its specific instructions while you wait for your paint to dry.
Dip your dried, painted porcelain object in glaze. If the object is too big to dip, apply an even, smooth layer of glaze to the entire surface of your porcelain piece. Avoid leaving any brush marks. You could blow on the glaze to even out obvious brush marks.
Set your kiln's temperature to about 1,300 degrees Celsius or 2,400 degrees Fahrenheit, and fire your Chinese porcelain for up to three days. If your Chinese porcelain manufacturer or kiln instructions suggest that you use different temperature settings or firing times, use those instead.
Remove your completed painted Chinese porcelain piece. The cobalt pigment should now appear a brilliant blue instead of black.