First I applied a blue colour wash to the canvas.

我先在画布上涂了一层蓝色水彩。

《牛津词典》

Wash separately or wash with same colour.

单独洗涤或与同类颜色洗涤。

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After the wash colour.

洗刷后色彩依旧。

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Use the foam brush tip to paint or colour wash in large areas.

使用泡沫刷子技巧绘或刷色在大范围。

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Use the foam brush tip to paint or colour wash in large areas.

使用泡沫刷子技巧绘或刷色在大范围。

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