Hi there, am looking to paint the interior of my wood windows and doors white to match the walls, while leaving the exterior a dark grey. What is the etiquette for where the border should be on the windows and frames if they open? I know the rule about doors, which is the hinge edge same colour as the exterior and strike edge same colour as the interior, but what about if the frame itself? Where is the border if part of the frame is interior and part exterior? Is there a guide online for painting opening windows different colours interior and exterior? Would appreciate any advice out there from professional house painters. Thanks!