copper-sulphate

Updated: May 11, 2025

There were a few fleecy wisps of cloud, but the entire surface upon which they gazed was one sheet of the now familiar deep and glorious blue peculiar to the waters of that cuprous solar system, with no markings whatever. "What d'you make of it, Mart? That's water all right copper-sulphate solution, just like the Osnomian and Urvanian oceans and nothing else visible.

E. E. (Edward Elmer) Smith - Skylark Three