According to the joint standard NACE No. 1 / SSPC-SP 5, what is the required condition of a steel surface after 'White Metal Blast Cleaning'?
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A
The surface must be free of all visible oil, grease, and dirt, but tightly adherent mill scale and rust may remain on up to 5% of the surface.
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B
The surface, when viewed without magnification, must be free of all visible oil, grease, dust, dirt, mill scale, rust, coating, oxides, and other foreign matter.
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C
The surface must be cleaned to a near-white metal condition, with no more than 33% of each square inch of surface area containing light shadows, streaks, or minor discolorations.
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D
The surface must be prepared using high-pressure water jetting to remove all contaminants, exposing the original blasted surface profile.