First I grab my greenware at before leather hard stage.
I also get my brush and wax resist.
Brush the wax resist where i want to draw. Sometimes it is a tiny area, sometimes it's the entire pot. make sure you shake the waz up real well and add 2-3 layers of wax. A thin application will make the underglaze bleed through.
Because it get's humid in florida and things don't dry quickly I set the cup in front of my trusty space heater for a few minutes
Then I grab my carving tools. Usually a pen, nail, toothpick, and tweezers that i have pulled apart. Carve my drawing into the waxed areas.
Brush underglaze onto the carved areas. The underglaze should get into the lines and pool on top. Take a moist sponge and wipe off excess.