Patent ID: 8425996

Claim:
A wound dressing suitable for visibly detecting microorganism growth at a wound site based on a colorless to colorful transformation of the dressing, said dressing comprising: a) a barrier membrane forming a top surface of said wound dressing; b) a layer suitable for contacting bodily fluids from a wound site susceptible to microorganism growth which layer forms a bottom surface of said wound dressing; and c) pH indicators comprising a plurality of hexamethoxy red and/or heptamethoxy red, for indicating the presence of acidic growth by-products in said layer from contaminating microorganisms, and wherein said hexamethoxy red and/or heptamethoxy red pH indicators are colorless at neutral pH of 7 and in the absence of a threshold level of microorganism growth by-products to colorful in the presence of a threshold level of microorganism growth by-products.