Wrong normals after merged two meshes I am just in mid of work, merged two meshes and one of the meshes turned out to become black. I have flipped the normals, no success, and then I recalculated them to be sure, no success again. If anybody happens to have an idea to solve this I would be glad to hear.

Thanks for your attention.
Your screen shot is not showing normals, 
Please try to select one Object and flip the normals in your required direction
select other object and flip the normals to your required directions

as you combined the Objects all ready please use the mouse hover and L key to select each object.

Take a look of the image if I understood your issue correctly







I hope it will help you