Paper indicator from natural plants, an experiment to find the local plants in natural ผลิตเป็น paper indicator available in general. The plant species using 6 include Bauhinia lumyai (Lee)) vegetables, ruellia tuberosa, cosmos and watercress pink and study the proper and appropriate solvent to make paper. Indicator The results showed that the bees and the lumyai is natural plants used to make indicator as well. When using water as solvent. The optimum ratio of solute per solvent is 1: 4 dyeing paper indicator, it was found that the paper indicator from Bauhinia purpurea Linn. Color is light brown and paper indicator from the lumyai color is light blue, and when used to measure pH found that paper indicator from the flower Bauhinia purpurea Linn. Change from light brown is light pink in the pH 1-3 and change from light brown to yellow green in the pH 8-14 paper indicator from the lumyai flowers. Change from pale purple, a light pink in the pH 1-3 and changed from the light purple, light green in pH 8-14.
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