Chapter 15 507 the number of those who do not, and so it may be argued that experiments on chemically damaged hair represent a more realistic simulation of real life conditions. However, it is obviously important not to abuse this situation by using severely over-processed hair that no longer possesses relevance. Figure 7 shows experimental results for double bleached hair treated with a commercially available 2-in-1 shampoo and two different conditioner products. Obviously there is no doubting the sizable advantage provided by such treatments, yet communication of this benefit must still be fair and reasonable. Quantification of Other Conditioning-related Benefits— Anti-static When any two bodies are rubbed together there will be migration of electrons from one to the other. Thus, during grooming electrons typically travel from hair to comb or brush with subsequent development of a positive charge on individual fibers. In actuality, the sign of the developing charge depends on the relative positioning of hair and the comb/brush material in the triboelectric series, but the crucial factor becomes the repulsion that occurs between fibers Figure 7. Benefits of conditining treatments in term of brekage protection