Color in blender import

hello guys!!! as a base for modelize a room, my client send me a blender file… I download blender, then export in obj, then import in rhino without problems… BUT some of the objects are , when seing in the viewport as lines, in a very very pale shade of white, very difficult to see… It is not a layer color, everything is in the same layer, (black lines for rhino objects) but the blender objects arrived like that… I can’t find how to change that color for an honest black!.. thank you for help!!

Make sure that the Display Color in the objects’ properties is set to By Layer.