郑板桥

Based on the provided sources, no information about Zheng Banqiao as a Yixing pottery artisan is available. The sources appear to be empty or contain no relevant content about this individual's work in Yixing pottery.

It's worth noting that Zheng Banqiao (1693-1765) is historically known as one of the Eight Eccentrics of Yangzhou, famous for his paintings of bamboo, orchids, and rocks, as well as his calligraphy and poetry. However, the provided book sources contain no information connecting him to Yixing pottery craftsmanship.