These waters are frequently impregnated with alkali or salt, and on evaporating leave upon the bed of the lake a thin encrustation of snowy whiteness.
During the wet season the valleys often contain ephemeral lakes, whose waters on evaporating leave a playa, or mud flat, often covered with an alkaline encrustation of snowy whiteness.
Less Metal Visible: Smaller stones can fit together more closely, eliminating even more metal from showing through the diamond encrustation.
catheter encrustation in both methods is needed.
Bibby J. M., Hukins D.W. (1993) ' Acidification is not a feasible method for preventing encrustation of indwelling urinary catheters ' .