As a self-teaching beginner, I am always interested in techniques. This one seems to be the "scientific method" (fast and with reproducible results) for colour blends:
Keep a moist sponge ready. Fill your brush with colour. Then repeat the following until finished:
Paint one line, dab the tip of the brush lightly on the sponge, then paint the next line along the recent.
The colour in your brush will gradually become thinner and thinner, but the brush will not dry out before you have finished. If you moisten the paper in the beginning, the line structure (see photo) will not appear after drying.