2-Methoxyphenolphthalein and 2,6-Dimethoxyphenolphthalein

o-Cresolphthalein and p-Xylenolphthalein

Colourful Phthalein Indicators!

Shinoda Test: Clover Extract

Anthocyanin pH changes: Violet Rhodedendron

Anthocyanin pH changes: Pink Azelea

Anthocyanin pH changes: Purple Lupin

Purple Glowstick Reaction - 1,8-Diphenylanthracene

Red Glowstick Reaction - Rhodamine B

Yellow Glowstick Reaction - Rubrene

Blue Glowstick Reaction - Perylene

Bromothymol Colour Change - Sulfur Dioxide.

Bleaching Anthocyanins with Sulfur Dioxide.

Colourful Meisenheimer Complexes

Colourful Lophine Radicals - Photochromism Demo

Bicarbonate Indicator - Detection of carbon dioxide

Bromophenol blue and Bromocresol green

Cresol red, Bromocresol purple and meta-Cresol purple

Phenol red

Thymol blue

Bromothymol blue

Phenolphthalein and Thymolphthalein

Colourful Crystal Violet

Unusual phenolphthalein colours

Hexafluorobenzene pi-pi stacking demo 2

Hexafluorobenzene pi-pi stacking demo

Lobelia pH indicator under a sodium lamp

Alkaline Earth Metals: Colourful Flames!

Colourful Complexes: Raspberry Alum and Caffeine

Colourful Complexes: Bramble Alum and Caffeine part 2