There is no mercury in the Wuliangchun 50-degree bottle cap. Mercury is a poisonous and volatile liquid metal. Wuliangchun Wine is a sub-brand of Wuliangye. It is a product of a regular company and its quality is guaranteed. Wuliangchun 50% wine bottle cap does not contain mercury, so you can drink it with confidence. The genuine Wuliangchun product has complete packaging and a beautifully made trademark with clear strokes and a three-dimensional effect. If the trademark is crudely made and unclear, it is a fake.