Ключевые слова: background, black, boil, bosom, bubble, contamination, cream, debasement, dirt, dross, effervescence, filth, foam, foaming, formation, foulness, froth, frothing, grime, ground, lather, level, liquid, mess, pattern, pollution, scum, setup, skim, skimming, smudge, soil, soiling, spume, stage, structure, surface, texture, water, white,