The R&F Pigment Stick, 38ml Blending Stick is a pigment stick without colour.It can be worked into a colour to increase the colour's transparency or to blend colours together on the surface.R&F Pigment Sticks are seductively soft oil paints in stick form, providing today's artist with a truly direct way to work.They contain no dryers, no fillers or adulterants and no expedients of any kind.Because we do not use shortcuts, the wonderful workability of our Pigment Sticks depends on a very careful balance of oil, waxes and pigment.Blending stick consists of damar resin.