I have enough mugs for a kiln all ready to carve.   For those interested in the sgraffito process--after I trim the foot and attach the handle (I pull the handles directly from the side of the mug which means each handle is a little different), I leave the mugs to set up upside down.  The pulled handle is significantly wetter and more flexible than the leather hard mug.  I uually cover them for a day or so until the mug and handle are at about the same dryness.   Also, drying upside down keeps the handle from sagging downward into an unusable shape.   Then I paint both sides with a black slip.  The slip is made from dried trimmings which I crush to a powder (in a plastic bag and while I'm wearing a respirator mask to keep from breathing silica dust).  Then I mix the powder with water until smooth with a hand blender.  The result is kind of like pudding or yogurt.  A black stain (I use Mason Stain--best black) is mixed in with a little more water.  Normally I thin the slip enough to paint 2 thin coats.  It takes about a day for the covered, stained mugs to set up enough to carve.  I like to carve them when they are still fairly soft because I prefer the woodcut look.  Some artists wait until the pot has dried out completely, then, using very fine tools  they can carve extremely thin, delicate lines