A non-toxic, putty type, medium made with French Walnut oil.
For achieving impasto effects there really isn't a better medium, depending on the amount you add, you can take the paint from just holding brushmarks to full on, palette knife, sculptural effects.
Can be used to just to give more body to the paint and make the brushstrokes 'shorter'.
No solvents and no distinguishable smell.
There is very little colour shift when added to paint, although any shift will be more apparent in transparent colours.
This is a simple product, non-toxic that really works, a pleasure to use.
Available in 50ml tubes or 250ml tins.