2008 TRI/PRINCETON CONFERENCE 231 images also indicate that the anti-fading system treated fi bers have much stronger dye intensity as shown with red or yellow color (higher pixel intensity) than the untreated fi bers as shown with blue color (lower pixel intensity). ANTI-FADING EFFECT OF PQ-55 SYSTEM AGAINST COMMERCIAL COLOR LOCK PRODUCTS Hair tress tests. A three step PQ-55 anti-fading system consisting of 2% PQ-55 leave in treatment gel, 0.5% PQ-55 shampoo and 0.4% PQ-55 conditioner was evaluated for its color protection effect against a commercial color lock shampoo and conditioner product. The color protection effect of PQ-55 three step anti-fading system versus a commercial benchmark was tested with three types of hair: dyed bleached hair, dyed grey hair and dyed Piedmont hair. Figure 12a shows the color changes of the three different types of dyed hair samples after 10× treatment and washes with PQ-55 three step system and the commercial color lock shampoo and conditioner product, respectively. PQ-55 three step anti-fading system shows superior color protection effect over the commercial color lock shampoo and conditioner system for all three types of hair tested, providing 35%, 38% and 40% higher color protection for dyed bleached hair, dyed grey hair and dyed Pied- mont hair, respectively. The results in Figure 12a also indicate that PQ-55 anti-fading system provides similar anti-fading protection on each hair type tested, although they fade to a different extent. Figure 12b shows the pictures of dyed grey hair and dyed Piedmont hair after 10× treatment and washes with PQ-55 anti-fading system and the commercial benchmark. Figure 12c is the subjective panel test results of the dyed Pied- mont hair after 10× wash and treatment with PQ-55 anti-fading system vs the com- mercial benchmark (the hair samples from the test in Figure 12b). The average of eight panelists agrees that the hair tress treated and washed with PQ-55 anti-fading system is darker than the hair tress treated and washed with the commercial benchmark. The Figure 11. FTIR spectra and images of treated and untreated dyed bleached hair fi bers after 5× washes, burgundy color dye. An average spectra of 500 spectra.

JOURNAL OF COSMETIC SCIENCE 232 color difference is within the range from slight to moderate under the three light sources used. Therefore the higher color protection effect of PQ-55 system over the commercial benchmark tested is perceivable by the naked eye. Salon tests with human hair mannequins. The effectiveness of color protective benefi t of PQ-55 in a three step anti-fading system was further evaluated in salon tests on a dyed mannequin head with human hair. This test was conducted with comparison to two com- mercial color lock products. One was shampoo and conditioner system which claims the color lock effect and the other was a three step commercial color lock system consisting of leave-in treatment, shampoo, and conditioner. The dyed mannequin hair was divided into two halves. The right side of the head was treated with the following regimen: 2% PQ-55 leave-in gel, dried washed with 0.5% PQ-55 shampoo treated with 0.4% PQ-55 conditioner, rinsed. The left side of the head was treated with commercial leave-in prod- uct (if part of regimen), dried washed with commercial shampoo, application of com- mercial conditioner, and then rinsed. The procedure was repeated by 10 times. Color analysis of the mannequin head was conducted in three ways: L, a, b reading of hair on both sides of the head using the Hunter Lab colorimeter visualization of digital pictures and image analysis for color intensity and darkness changes as described in the method section. Figure 13 shows the pictures of mannequin Gabrielle dyed in intense red color after 10 cycles of washed and treatments. It shows clearly that PQ-55 three step anti-fading sys- tem is much more effective than the commercial shampoo and conditioner treatment in preventing hair color fading from shampoo stripping. Figure 12. (a) Color loss of dyed hair samples treated with PQ-55 3-step anti-fading system versus com- mercial benchmark. (b) Pictures of dyed grey hair and dyed Piedmont hair samples after 10× washes and treatment. (c) Subjective panel tests of dyed Piedmont hair after 10× washes.