(a) The marking required in this subpart —   (1) Must be durable, in English and printed on or affixed to the surface of a package or on a label, tag, or sign.   (2) Must be displayed on a background of sharply contrasting color;   (3) Must be unobscured by labels or attachments; and   (4) Must be located away from any other marking (such as advertising) that could substantially reduce its effectiveness.

(b) [Reserved]

[Amdt. 172-29, 41 FR 15996, Apr. 15, 1976, as amended by Amdt. 172-29B, 41 FR 57067, Dec. 30, 1976]