Abstract Density-wave fronts in a vibrofluidized wet granular layer undergoing a gas-liquid-like transition are investigated experimentally. The threshold of the instability is governed by the amplitude of the vertical vibrations. Fronts. which are curved into a spiral shape. https://www.roneverhart.com/BULK-PACK-3-12-Ivory-Dragon-Cloud-Premium-Texture-Fibrous-Paper-Lantern/