It was sweet water.
The guide drank eagerly and so did we.
"That's snow water," Terry announced.

"Must come from way back in the hills." But as to being red and blue--it was greenish in tint.

The guide seemed not at all surprised.

He hunted about a little and showed us a quiet marginal pool where there were smears of red along the border; yes, and of blue.
Terry got out his magnifying glass and squatted down to investigate.
"Chemicals of some sort--I can't tell on the spot.

Look to me like dyestuffs.