Stains

1) Acid Stain - See Pickle Stain.

2) Air Stain - Superficial, uniform light-to-dark brown discoloration or dulling of the initial luster due to atmospheric attack.

3) Oil Stain - Localized brown or black discoloration on the surface of a product caused by incomplete removal or burning of lubricants.

4) Water Stain - Localized light-to-dark and often iridescent residue with sharply outlined darker border left from evaporation of water acquired from mill processing, transit or storage.

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