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  1. sciencenotes.org
    https://sciencenotes.org/how-to-make-thymolphthalein-ph-indicator

    How to Make Thymolphthalein pH Indicator - Science Notes …

  2. sciencenotes.org
    https://sciencenotes.org/how-to-make-disappearing-ink

    How to Make Disappearing Ink - Science Notes and Projects

  3. libretexts.org
    https://chem.libretexts.org/.../Reference_Tables/Acid-Base_Indicators

    Acid-Base Indicators - Chemistry LibreTexts

  4. thoughtco.com
    https://www.thoughtco.com/thymolphthalein...

    How to Make Thymolphthalein pH Indicator - ThoughtCo

  5. thoughtco.com
    https://www.thoughtco.com/how-to-make-disappearing-ink-606318

    How to Make Disappearing Ink - ThoughtCo

  6. libretexts.org
    https://chem.libretexts.org/.../Acids_and_Bases/Acid/Indicators

    Indicators - Chemistry LibreTexts

  7. rsc.org
    https://edu.rsc.org/experiments/disappearing-ink/424.article

    Disappearing ink | Experiment - RSC Education

  8. libretexts.org
    https://chem.libretexts.org/Bookshelves/General_Chemistry/Map...

    17.3: Acid-Base Indicators - Chemistry LibreTexts

  9. sigmaaldrich.com
    https://www.sigmaaldrich.com/US/en/product/sial/89360

    Thymolphthalein ACS reagent, indicator pH 8.8-10.5 125-20-2

  10. nih.gov
    https://pubchem.ncbi.nlm.nih.gov/compound/thymolphthalein

    Thymolphthalein | C28H30O4 | CID 31316 - PubChem

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