A close view of Joan's inpainting palette: the stable, non-discoloring synthetic medium and solvent are kept in small glass botttles perched on the palette.
Tiny dots of dry pigment are placed on the palette to which a small amount of medium is added. Surface gloss, transparency, opacity, and color can be controlled by brush-grinding the paint.
A small No. 1 or No. 2 watercolor brush is used for mixing and applying the inpaint. All colors are matched by eye.