[化学相关] pH indicators

Bromothymol blue may be used for observing photosynthetic activities, or as a respiratory indicator (which turns yellow as CO2 is added). 

Also used together with phenol red to monitor the fungal asparaginase enzyme activity - enzyme activity causes it to turn blue, indicating increase in pH.

^ from Wiki

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相关的人物设定// 

Water

< pH indicator >

Phenolphthalein

Acidic | Neutral | Basic 

Colourless | Colourless | Pink

变色范围：pH8.2-10.0
（部分资料写8.3-10.0，总之高于7 ww）

Synthetic pH indicator。因为是人工合成的所以对周围的物质都感到好奇。
单纯善良，见到sodium hydroxide或是其他alkali 会脸红。