As a color junky, my foray into ceramics was necessarily short lived.  I painted greenware then fired it in a kiln I owned.  Such muted colors were achieved on these bird tiles.  Perhaps with the exception of yellow. The difficulties of formulating a reliable true red glaze was the death knell for ceramics.  The kiln sat in my basement for a couple decades until it found a new home.  It’s now being used by an artist friend, Mira, to create lovely pieces of fused glass.