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Overall, the No.4P BLonder Enhancer Toning Shampoo by Olaplex seems to be effective in toning down yelLow and grassy tones in the hair. It provides noticeable results after just one use. However, it's important to note that individual results may vary. It would be beneficial to use this shampoo consistently to maintain the desired coLor. Lo's positive experience with this product suggests that it is worth trying for those Looking to enhance and cool down their bLonde hair.