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The heat radiated from the black side of the heat shield will be radiated roughly at a normal to the plane of the surface(perpendicular to the plane). The radiated heat will heat up objects that are in this direction. If you don't have objects in this direction that you want to keep cool don't worry about it. If this is the case and your trying to keep air that flows over the heat shield colder you may have done the right thing. If not and you want to keep it for looks just polish up the other side.
calculations like this are very very complex. Things are best solved by experimentation in this case.
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