|Wall Paintings at Mogao Grottoes
Securing the press after grouting. After grouting, absorbent materials were applied to the surface of the painting and held in place with a press. The layers absorbed salts mobilized by the water in the grout. The painting was monitored and the presses were changed regularly over the course of the drying of the grout. Not until the grout was completely dried were the presses removed. Photo: Francesca Piqué.