Standing inside YESCO sign company's Natomas warehouse, Jinbo Xia heated a four-foot long glass tube in an open flame called a ribbon fire. He kept the empty tube from imploding by blowing air through a thin hose running from his mouth to one end of the tube. Xia gently rushed the tube to a work table and began bending the material before the glass cooled. Working with both hands and mouth, he used a disappearing craft to form the "C" in the Crest Theatre's landmark neon sign. He later added electrodes and "bombarded" or filled the letter with red neon gas that would turn the powder-coated glass tube pink. The 39-year-old learned the art of making neon light units from his father, who ow