As used in this chapter, “clear legible type” means type which meets all the following qualifications:

1. (a) Is clear and legible.
2. (b) Is of a bright color which will be clearly visible against either a light or a dark background.
3. (c) Is printed by some method other than rubber stamp, such as by offset or letterpress, so as to prevent the ink from smearing and to insure that the printed matter will be clear and distinct.

4. (d) Is not less than the following size:

   Total of length and width
   of bag combined	Size of type
   Less than 30 inches	10 point
   30 inches or more, but less than 40 inches	14 point
   40 inches or more, but less than 60 inches	18 point
   60 inches or more	24 point