Full Description 1. Purpose and Scope 1.1 This test method provides a means of measuring the effectiveness of commercial rewetting agents on cotton fabrics. 2. Principle 2.1 A test specimen is padded in a water solution of a rewetting agent and dried. A drop of water is then carefully deposited on the taut surface of the specimen and the time required for a specular reflection of the water is recorded as the rewetting time.