van son – rubberbase Inks

Van Son[NL]  official site with downloadable pdf of the colours
Polymetaal [NL] has some Conditioners for van Son Rubber Base Inks.
Polymetaal [NL] carries the van son inks (also 1 kg)
Mayday Graphics [UK] has a good selection of colours
Paperworks [US] has a selection of them too

Royal Dutch Printing Ink Factories Van Son, Hilversum, Holland.