Non Linear Halfords Concentrated Screen Wash

[harry]

The purple colour is caused by stuff added to it to give it a bad taste and also not be mistaken for water. Discourages people from drinking it.

[Max Demian]

Actually the stuff that makes it nasty to drink is usually pyridine, which is colourless. The purple dye is something different.

[The Natural Philosopher]

N-(4-(bis(4-(dimethylamino)phenyl)methylene)cyclohexa-2,5-dien-1-ylidene)methanaminium chloride)

Apparently.

[Huge]

[27 lines snipped]

Correct.