Some of the main ideas behind Impressionism were condensed into the "pointillist" technique of painters such as Seurat and Signac. The idea is that optical colour mixing occurs when dots or dashes of colour are interspersed on top of each other.
I just had a go and found that it is very time consuming (so best not make your painting too big!)
My palette consists of roughly one warm primary and one cool primary x3. From left to right lemon yellow, indian yellow (or yellow ochre) , cadmium red, alizarine crimson, ultramarine blue and pthalo blue.
The strokes going in the same direction helps cover ground quickly and leave some paper showing to maintain the light.