This test method provides a quantitative procedure for the evaluation of the degree of antibacterial activity. Assessment of antibacterial activity intended in the use of such materials. If only bacteriostatic activity ( inhibition of multiplication) is intended, a qualitative procedure which clearly demonstrates antibacterial activity as contrasted with lack of such activity by an untreated specimen may be acceptable. However, if bactericidal activity is intended or implied, quantitative evaluation is necessary. Quantitative evaluation also provides a clearer picture for possible uses of such treated textile materials.