Its mentioned all the time as Obsidian Oil ... if you go to their website its ingredient is food grade mineral oil.... who cares if its black or clear ?? I can't get obsidian oil without ordering it but I have a bottle of the butcher block oil for my cutting board so I use that.Just curious how you're making out with the butcher block oil, I picked up some walrus butcher block oil recently and it seems to be working great, not sure why it's not mentioned more for stems.