Eyeing China’s burgeoning middle class, California wineries are exploring how they can better tap into what’s becoming a major potential market. Lab technician Sydney August draws a sample of pinot noir juice from an oak barrel at Black Stallion Estate Winery in Napa on Wednesday. Erica Zavaleta processes freshly picked cabernet sauvignon grapes at Black Stallion Estate Winery in Napa on Wednesday. Vapor from dry ice – used to cool grapes and remove oxygen – billows from a bin as freshly picked cabernet sauvignon grapes are processed at Black Stallion Estate Winery in Napa. Black Stallion Estate Winery exports three top tier wines to China: Bucephalus, Transcendent and Black Stallion Reserve.