特殊用法bacterial discolouration1.细菌性变色black discolouration1.变黑, 出现黑斑(于烧成物表面)heat -age discolouration1.热老化变色iron sulphide discolouration1.硫化铁黑变meat surface discolouration1.肉表面变色pink discolouration1.(皮革)发红red discolouration1.红变[白坯发红]surface discolouration1.表面变色tallowy discolouration1.油脂泛白(干酪缺陷)yellow discolouration1.变黄, 泛黄