Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
pH indicator that can also be used to makeinvisible ink .
Etymologies
Sorry, no etymologies found.
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Examples
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I did find instructions for making colored bubbles, but it involved stuff like sodium hydroxide and blue thymolphthalein and red phenolphthalein.
azcentral.com | news 2010
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In these cases, phenolphthalein, thymolphthalein or other compounds that are colorless in acidic ranges are often used.
mental_floss Blog Matt Soniak 2010
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