A cosmetic shall be deemed to be adulterated:
"Caution - This product contains ingredients which may cause skin irritation on certain individuals and a preliminary test according to accompanying directions should first be made. This product must not be used for dyeing the eyelashes or eyebrows; to do so may cause blindness."
and the labeling of which bears adequate directions for such preliminary testing. For the purposes of this subdivision and subdivision (5), the term "hair dye" shall not include eyelash dyes or eyebrow dyes;
§ 196.110, RSMo