§73.50 食品着色剂群青�?Ultramarine blue)

　　（a� Identity. The color additive ultramarine blue is a blue pigment obtained by calcining a mixture of kaolin, sulfur, sodium carbonate, and carbon at temperatures above 700 ��C. Sodium sulfate and silica may also be incorporated in the mixture in order to vary the shade. The pigment is a complex sodium aluminum sulfo-silicate having the approximate formula Na7Ai6Si6O24S3.

　　（b� Specifications. Ultramarine blue shall conform to the following specifications:

　　Lead （as Pb�? not more than 10 parts per million.

　　Arsenic （as As�? not more than 1 part per million.

　　Mercury （as Hg�? not more than 1 part per million.

　　（c� Uses and restrictions. The color additive ultramarine blue may be safely used for coloring salt intended for animal feed subject to the restriction that the quantity of ultramarine blue does not exceed 0.5 percent by weight of the salt.

　　（d� Labeling requirements. The color additive shall be labeled in accordance with the requirements of ��70.25 of this chapter.

　　（e� Exemption from certification. Certification of this color additive is not necessary for the protection of the public health, and therefore batches thereof are exempt from the certification requirements of section 721（c� of the act.

　　��73.50　群青艱�/p>

　　（a）特性：群青色着色剂，是一种蓝色色素，由高岭土、硫磺、硫酸钠和炭在约700℃下煅烧而得（有时也在混合物中加入硫酸钠和硅石以改变其色度）。本着色剂为硫化硅酸铝钠的复合物，其分子式约为Na7Al6Si6O24S3、�/p>

　　（b）质量规格：群青蓝应符合下列质量指标９�/p>

　　铅（以Pb计），不超过10mg/kg、�/p>

　　砷（以As计），不超过1mg/kg、�/p>

　　汞（以Hg计），不超过1mg/kg、�/p>

　　（c）使用和限制条件：着色剂群青色可安全地用于动物饲料用盐的着色，但应符合用量（不得超过盐量的0.5%）的限制条件、�/p>

　　（d）标签标注方式：本着色剂应按本章��70.25中的规定标注标签、�/p>

　　（e）免除产品证书：本着色剂免除产品证书以保护公众健康。所生产的每批产品也免除按法�?21（c）节规定的需要产品证书、�br />