The ASTM E3364-22 Standard Test Method for Evaluating Anti-Streptomyces (Pink Staining Organisms) Staining Performance of Antimicrobial Agents in or on Polymer Porous and Non-porous Materials standard specifies a method for evaluating the anti-Streptomyces staining performance of antimicrobial agents on polymer materials, whether porous or non-porous. This test tests the effectiveness of antimicrobial agents on materials by using a Streptomyces species (which can cause pink staining) as the staining source. This standard helps to verify the performance of antimicrobial products, ensuring that they can effectively prevent staining problems caused by Streptomyces contamination. It is suitable for the evaluation of antimicrobial agents on a variety of materials such as Spinning & weaving products, plastics, etc. Through this testing, manufacturers can ensure that the antimicrobial properties of their products meet industry requirements, while increasing the mass and durability of their products.