Cheryl Konrad has spent the last 35 years educating visitors to her Lahaina, Hawaii, store about the centuries-old history of scrimshaw. Konrad fills the shelves in Lahaina Scrimshaw with the etchings of local artists on fossilized walrus and mammoth ivory. But if a bill to ban the sale of ivory becomes law this year, she worries that she will be forced to close her store. “I feel like I’ve been a part of history. It’s just so hard to fathom that it could be criminal eventually,” Konrad said. Similar legislation in previous years has failed largely because of pushback from...