Dynamite Baits Big Fish River Bait Soak - Shrimp/Krill Soak 500ml

It seems you're describing a liquid attractant for fishing, specifically a "Proven River Flavour" that's designed for use with PVA friendly products. This attractant is water-soluble, allowing for rapid leak-off and is suitable for use with hookbaits, groundbait, and spod mixes. It comes in a 500ml bottle with a screw cap, making it easy to dispense and store.