加酸顯色材料(halochromic material)是一種會隨着pH值改變而改變顏色的材料。其英文字根「chromic」,即「着色異常」指的是會因為外在參數的改變而改變顏色的材料。在這裏,這個參數即是pH值。而酸鹼指示劑就是利用這種特性製成。

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