Lascaux Retouching Medium is a 50% solution of Mowilith 20 (AYAB) in ethanol/acetone 7:3. It can be mixed with appropriate powder pigments directly on the palette. Since every pigment has a different binder demand, experience is required to get the right balance between binder and pigments. To dilute the Lascaux medium, it is recommended to use a mixture of ethanol and 10-30% of cellosolve or diacetone alcohol, in order to adapt the drying time of the medium to the requirements of the retouching.