分析成分：
Soft drink - Colours
Known weights of three food colours were added to a diluted solution of commercial soft drink concentrate.
Certified values
Ponceau 4R (E124) 胭脂红.................................. 18.7 mg/L
Tartrazine (E102) 柠檬黄...................................... 29.9 mg/L
Sunset yellow (E110)日落黄................................ 19.6 mg/L