Buch, Kurt published the artcileThe influence of temperature on pit determinations with color indicators, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, the publication is Suomen Kemistiseuran Tiedonantoja (1930), 2, database is CAplus.
The buffer solution should preferably be brought to the temperature of sea water in situ but if Walbum’s correction tables are used this cannot be under 10°. The pH of a sample at t° is the pH at the buffer t + α(ta – tb). α from Walbum’s table: for α-naphthophthalein -0.0084, phenolphthalein -0.01, phenol red 0.01 and cresol red -0.0053. If the temperature has changed during the colorimetric readings also add α'(ta – ta), α’ being 0.006 for α-naphthophthalein and 0.004 for phenol and cresol red. Phenolplithalein requires no correction.
Suomen Kemistiseuran Tiedonantoja published new progress about 596-01-0. 596-01-0 belongs to benzofurans, auxiliary class Benzofuran,Naphthalene,Alcohol,Ester, name is 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one, and the molecular formula is C28H18O4, Recommanded Product: 3,3-Bis(4-hydroxynaphthalen-1-yl)isobenzofuran-1(3H)-one.
Referemce:
https://en.wikipedia.org/wiki/Benzofuran,
Benzofuran | C8H6O – PubChem