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ANSWER TO MYSTERY TECHNIQUE #63:
Both #62 and #63 use white fluid acrylic paint and part of a thin plastic bag to create texture. Last time, I put the white layer down first; this time, I started with a wet-in-wet layer of blue-gray with a little magenta. After it dried, I got the paper wet again and applied the diluted white on top of the dark layer. I then pressed part of a thin plastic bag onto the wet paint and manipulated the wrinkles in the plastic to vary the shapes. After the paint dried, I peeled off the plastic.