Hydrofera Blue Classic Antibacterial Foam Dressing. A foam dressing containing two components, methylene blue and gentian violet, in open-celled polyvinyl alcohol (PVA). Features: Broad-spectrum antibacterial protection, Rapid wicking and exudate retention, Assists in autolytic debridement, Resolution of epibole and flattening of wound edges, Non-cytotoxic, Compatible with enzymatic debriders and fibroblast growth factors, Helps maintain a moist wound environment.