Indicators (Indicator) is an acid test of the communication – bass, the most complex organic structures are weak acids or weak treasure, but most are weak acids. Treasures of the indicators 1. indicators, each with a range of pH change color co., Ltd. 2. indicators are generally compounds that different colors. 3. the colour of the indicators will change when the pH value is changed. Because each type of indicators changes color in the range pH limited detection of pH value of aqueous solution is not easy, so the introduction of multiple types of indicators that have a pH range, continuous mixed together in the proper aspect ratio, color changes can be in the range of pH of the aqueous solution has a wide is called universal indicators (Universal indicator).Natural extracts and juice from a cabbage purple Juice from the pea and rose used as indicators. Called "natural indicators".
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