White Water Rafting? Why Not Blue Water?

Jillian:

It shouldn't be 'blue water.' That's a misnomer. Brown water's bad too. And red water's REALLY BAD. It can mean death.

Christine:

Purple water's bad too. It means there's a mill upstream.

Jillian:

*wtf?*

Christine:

Purple. Dye. Textile factory.

Jillian:

Apparently it also means it's the 1890s!