In the video, the He Family is working on finishing their Reserve Laoshan Black tea – the first Da Tian harvest of the spring, after the greenhouse covers come off for the season. Made entirely of tender buds, the tea leaves oxidize for at least eight hours, after being picked, withered, heat-fixed twice and curled, and before being dried and finished. As Mr. He explains, they can work with up to 900 jin (450kg) of fresh leaf at a time when making black tea. After over 8hrs of work, those fresh tea leaves will become just about 200 jin (100kg) of finished Laoshan Black tea.