EXAMPLE FOUR

Blue Sky, Grey Clouds, watercolour, 7310½in (18326.5cm)

This is a more striking sky, using the same basic technique, but with the introduction of another colour for grey clouds and discreet crisp cloud edges. The former is a mixture of French ultramarine with light red. The latter results from not wetting small selected areas of the paper. Wet the rest of the paper surface as before and paint the blue sky until it meets the dry bits of paper. Thereafter, the grey clouds are painted but not meeting the blue wash. There is some diffusion in the lower-right corner owing to their proximity to each other. Note that the grey wash in the upper-left corner is bluer whereas the bottom grey wash contains less blue. The upper-right corner has a very dilute grey wash