Article 18
The conditions under which bred seed potatoes of generations prior to basic seed potatoes may be placed on the market under Article 4, shall be as follows:
1. they must have been produced in accordance with accepted practices for the maintenance of the variety and of health;
2. they must be intended mainly for the production of basic seed potatoes;
3. they must satisfy the minimum conditions to be established by the procedure referred to in Article 25(2) for pre-basic seed potatoes;
4. they must have been found by official examination to satisfy the minimum conditions referred to in (c);
5. they must be placed in packages or containers in accordance with this Directive; and
6. the packages or containers must bear an official label giving at least the following particulars:
  - certification authority and Member State or their distinguishing abbreviation,
  - producer's identification number or lot reference number,
  - month and year of sealing,
  - species, indicated at least in roman characters, under its botanical name, which may be given in abridged form and without the authors' names, or under its common name, or both,
  - variety, indicated at least in roman characters,
  - the description ‘pre-basic seed potatoes’.
The label shall be white with a diagonal violet line.