Article 13
1. Member States shall require that packages and containers of basic seed potatoes and certified seed potatoes: (a) be labelled on the outside with an official label which has not previously been used, which fulfils the conditions laid down in Annex III and the particulars of which are provided in one of the official languages of the Community. The colour of the label shall be white for basic seed potatoes and blue for certified seed potatoes. When a label with a string-hole is used, its attachment shall be ensured in all cases with an official seal. The use of official adhesive labels shall be authorised. In accordance with with procedure referred to in Article 25(2), the indelible printing of the prescribed particulars on the package in accordance with the label model may be authorised under official supervision; (b) contain an official document, in the same colour as the label, providing at least the label particulars required under Annex III(A)(3), (4) and (6). This document shall be drawn up in such a manner that it cannot be confused with the official label referred to under (a). This document shall not be necessary if the particulars are printed indelibly on the package or if, in accordance with the provisions under (a), an adhesive label or a label of tear resistant material is used. 2. Member States may provide for exceptions to paragraph 1 in the case of small packages sealed in their own territory. Conditions relating to these exceptions may be determined in accordance with the procedure referred to in Article 25(2).