Hydrofera Blue CLASSIC PVA foam dressing uses two organic pigments gentian violet and methylene blue to deliver non cytotoxic antibacterial protection without releasing active substances into the Hydrofera Those who know, know there's no comparison. Hydrofera Blue provides antibacterial and non cytotoxic protection for faster wound healing and helps pull harmful bacteria laden slough, exudate, and debris away from the Hydrofera Blue Ready Antibacterial Foam Dressing 8" x 8" Medical Supply Surplus Hydrofera Blue Foam Dressing without Border, Box of 10 Hydrofera Blue Classic HB2214 Antibacterial Foam Dressing, 2 X 2 Inch, Box of 10