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CommercialEvenly dispersed very light shadows, streaksand discolorations caused by stains ofrust,mill scale or coatings may remain on nomore than 33 percent ofthe surface. Slightresidues ofrust and coatings may be left, ifthe original surface is pitted.

Near - White MetalEvenly dispersed very light shadows,streaks md discolorations caused bystains ofrust, mill scale or coatingsmay remain on no more than 5 percentofthe surface.

Viewed without magnif ication

White MetalFree ofall visible oil, grease, dirt, dust,

mill scale, rust and coatings.

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Degrees of Cleanliness of Blast-Cleaned SurfacesBrush-0ffTightly adherent mill scale, rust andcoatings may remain on the surface. Millscale, rust and coatings are consideredadherent ifthey cannot be removed with a

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Note: Consult with local standards organization to obtain complete specifications on degrees ol surface cleanliness.