This piece was painted on tan Art Spectrum paper. It was taped down to a board and wet a la Stan Sperlak. After I laid in a hard pastel base, I soaked it with water. It did bubble up with the moisture, because it wasn't heavy Pastelboard, but it laid down nicely again. Although there is pastel on the paper at this stage, it seems integrated with the tooth using this method, making the sanded paper seem even rougher.
soft pastel on Art Spectrum