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Morris Louis's technique, which became known as Colour Stain painting, involved pouring liquid paint directly onto unprimed canvas so that the pigment is soaked into the surface. Diaphanous layers of colour are built up one by one and blend into each other. The critic Clement Greenberg praised this process as 'pure painting' leading to the definitive unity of colour and surface. While such works emphasise the flatness of the canvas, they also have an absorbing, enveloping quality.