Phenolphthalein

Using Phenolphthalein As An Acid – Base Indicator
ScienceCompany
Apr 17, 2012
Phenolphthalein indicator is pink or fuchsia in alkaline solutions starting at about pH 8.2.
Phenolphthalein loses color again above pH 12.

Making Phenolphthalein
NileRed
Feb 3, 2015
phenolphthalein is synthesized by the condensation of phenol and phthalic anhydride
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Make phenolphthalein- A Acid Base Indicator
MRK Chemistry
Jul 31, 2016

Phenol is very poisonous, take extreme caution when working with it.
Wear a gas mask at all times.

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Anthocyanin: a pH indicator

Make your OWN pH Indicator from Red Cabbage!
Thoisoi2 – Chemical Experiments!
Sep 29, 2014

red cabbage: 28.7 mg/100g anthocyanin
elderberries: 1317 mg/100g
blueberries: 48 mg/100g,

Natural indicators
FlinnScientific
Dec 18, 2012
Rose petals, herbal (hibiscus) teas, grape juice, apple skins—students will love testing their favorite flowers or fruits.