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Pack of 20 strips to measure pH of creams, soaps or any cosmetic you make at home. They are easy to use, very useful and show the instant result. The pH strips are accompanied by a color legend so you can interpret the result. Each color is associated with a degree of pH. The pH test strips that you can buy in Gran Velada are a must when making handmade cosmetic products. These strips of reactive paper determine the degree of pH by changing color. Here's how to measure the pH of the products you make at home.