Thanks to Roy from iZods Ink I was happy to review another Robert Oster’s ink called – Ruthenium. This is quite interesting colour, which is not that grey as you may assume keeping in mind that Ruthenium is a dark-silver metal (at certain conditions it has purplish hint). The colour itself is rather matte purple grey, which to so me extend is resembling Robert Oster Signature – Barossa Grape ink. Therefore, Ruthenium seems to be slightly less purple and not that intense as Barossa Grape. Interestingly in Ruthenium , purple tone is much more pronounced using wet nibs, whereas with finer nibs (or lighter strokes) ink looks greyish. There is a little bit of blue component. Similar inks are Herbin – Poussiere de Lune and Diamine -Damson.