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ANSWER TO MYSTERY TECHNIQUE #111:
Vinyl is the key to this mystery! I started by getting the whole piece of paper wet, then mixed diluted watercolors on the surface before placing a sheet of clear vinyl on top. By partially lifting the vinyl several times, I was able to trap different sizes and shapes of air bubbles underneath. As the water slowly evaporated, watercolor pigment became more concentrated and darkened the edges of the bubbles.