Thanks a lot, Box!
Yes you can! But...
I created 4 simple objects, added different colours and created a comoponent.
I deleted one or several objects, and I was able to purge two materials. But always the one I added last its material will not be purged. This has to be removed manually.
The problem is we have a hell of lot of components in our projects which are mostly downloaded from the warehouse (we are restaurantdesigners). This means a lot of mess, most of the materials are not labeled or purged before. It would help to know which objects are (were) assigned to the material. A plugin would help!
Regards Picky