Check the glossy maps. Any of the profiles I've looked at have the shiniest bits (chips along a worn paint surface for example) as white. However, in Octane they should be black.
Appreciate you help Alec. The Octane forums are not very active so hard to get advice there. For metal i have always used Glossy shader with IOR set to 1.0 and if i want to make a cooper like material i plug a bronze colored spec map. I have also used dirt material with for example rust plugged in to diffuse and metall…