| en litmus paper (n) |
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Source: English Wiktionary | ||
| en ph indicator (n) |
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Source: English Wiktionary | ||
| en phenolphthalein (n) |
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Source: English Wiktionary | ||
| en cresolphthalein (n) |
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Weight: 1.0
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Source: English Wiktionary | ||
| en chemical indicator |
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Weight: 1.0
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Source: English Wiktionary | ||