Usually it is a black marking, but it may be red mark.
This video is no longer available but, essentially, it stressed the fact that the black or colored markings on one end denote ‘This side up’. Make sure it’s at the top!
"Do it right the first time!"
Usually it is a black marking, but it may be red mark.
This video is no longer available but, essentially, it stressed the fact that the black or colored markings on one end denote ‘This side up’. Make sure it’s at the top!