α-Naphtholphthalein
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α-Naphtholphthalein (C28H18O4) is a phthalein dye used as a
pH indicator A pH indicator is a halochromic chemical compound added in small amounts to a solution so the pH (acidity or basicity) of the solution can be determined visually or spectroscopically by changes in absorption and/or emission properties. Hen ...
with a visual transition from colorless/reddish to greenish blue at pH 7.3–8.7.


References

PH indicators 1-Naphthols Phthalides Triarylmethane dyes {{organic-compound-stub