Losses in the paint film were filled using a traditional gesso made from chalk and animal glue, textured to match the original surface.

This was followed by a two-stage retouching system intended to conceal distracting evidence of past damage without eliminating the natural effects of old age. The first layer consisted of a water-based medium that created an opaque base, lighter and cooler in tone than the original. The second layer used thin glazes of synthetic resin-based restoration colours, whose appearance is closer to that of oil paint.

Finally the painting was varnished using a low-pressure spray to create a thin and even distribution.