Chapter 5 179 Evaluation of waving efficacy: The efficacy of waving lotions is usually measured by using either hair swatches or small bundles of hair. The pegboard method first published by Kirby is one such approach.50 A uniform pegboard that is 5.5 cm long, 1 cm wide, and contains 14 removable pegs of approximately 2 cm in height is used to perform this test. Two- gram swathes of hair are interlaced between the two peg rows without tension and secured at each end with rubber bands, as shown in Figure 15. After being wound through the pegs on the board, the hair is saturated with the waving lotion and the pegboard is placed in a capped container to prevent evaporation during treatment. After the specified treatment time, the pegboard is removed from the container, rinsed with water for 30 sec, and then saturated with a neutralizer for a prescribed time, followed by a final water rinse. After removal from the pegboard, the curled hair is immersed in water for at least 5 min and the length of the waved tress is determined to measure permanent set. Waving efficiency is calculated as given in Eq. 9. Eq. 9 Here A is the distance between the first and sixth peg, C is the length of straight hair, and B is the linear distance of the curled hair swatch. Haefele63 reported a method that has been referred to as the Test Tube Test Curl (TTTC).21 The TTTC is a quick quantitative Figure 15