Identifies four levels of mill scale and rust that are commonly found on surfaces of uncoated steel. It also identifies certain degrees of visual cleanliness after surface preparation of uncoated steel surfaces and of steel surfaces after total removal of any previous coating. Are defined by written descriptions together with photographic examples. Is equivalent to Swedish Standard SS 05 59 00 (88) which is used on a world-wide scale, contains 28 photographs and was published in the three ISO languages together with German, Dutch, Italian, Spanish, Portuguese, Arabic, Swedish, Japanese and Chinese.