让幼儿园糕点铅超标的“颜料”：难以理解的不是技术，而是动机

Group 1 - The core issue revolves around the abnormal lead levels in children from Gansu's Banshi Peixin Kindergarten, with skepticism regarding the investigation's findings and the potential involvement of nearby factories [1][2] - The investigation suggests that the food prepared at the kindergarten is a plausible source of lead contamination, although the motive behind such actions remains unclear [2][49] Group 2 - The environmental pollution theory fails to explain the significant lead levels found in children, as relatives of affected children did not show similar issues, indicating that the problem is localized to the kindergarten [4][5] - Blood lead levels in affected children were reported to be above 300 µg/L, with some exceeding 400 µg/L, which is significantly higher than those from a nearby kindergarten [6][9] Group 3 - The investigation mentions the use of lead-containing colored pigments in the kindergarten, but does not specify the exact type of pigment used [11] - The possibility of using chrome yellow (lead chromate) as a pigment is discussed, with historical precedents of illegal use in food coloring [12][48] Group 4 - There are documented cases of lead contamination in food products due to the use of illegal dyes, such as in Bangladesh where lead chromate was used to enhance the color of turmeric [21][55] - The article highlights that the lead levels found in the kindergarten's pastries were over 1000 mg/kg, far exceeding legal limits for food products [13][43] Group 5 - The article raises concerns about the potential confusion between food-grade lemon yellow and industrial-grade lemon chrome yellow, which could lead to serious health risks if misused [39][40] - The strict regulations on food additives in China are noted, emphasizing that the lead levels found in the kindergarten's products far exceed permissible limits [43][46] Group 6 - The article concludes that while the technical possibility of lead contamination through food coloring exists, the lack of clarity regarding the motive for such actions raises significant doubts about the investigation's findings [49][61] - The discrepancies in blood lead level testing methods are also mentioned, suggesting that local testing may have produced false negatives [62]