Graded washes: the watercolour exercise worth repeating

A graded wash starts at full strength at the top of the paper and fades to clear water at the bottom, one stroke at a time (sample).
Tilt the board slightly, keep a bead of paint along the bottom edge of each stroke and add a little more water to the brush each time.
Do three before every painting session this term. Skies, sea and shadows all start here.