Felt Marker Thin: Simulate the casual scrawl of letters created by a felt-tip marker.

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The press were crammed into rooms where the party's filing system sits: box files, with the names of obscure conferences stencilled onto them in felt-tip.

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Work on this "prototype" allowed him to figure out technique, layout and technical details like the type of paper (19-by-13-inch watercolor) and writing instruments (felt-tip pens).

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Drawn on a piece of paper, the spokesman said it was "full of the pop art motifs we have now come to recognise, including Warhol's signature bright red lips, made using lipstick, and a typically pop art blocked background, coloured with green and orange felt-tip pen".

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