Explicitness is defined as not leaving the meaning of the warning to the imagination of the viewer. The warning must also be as short as possible, without leaving out essential items. The use of well designed and tested pictorials can aid in both of these tasks. The warning must motivate the viewer to avoid the hazard. This is the most difficult task for the warning.
Motivation is done by a combination of efforts.
The consequences information must present the real dangers of the hazard in such a way that the viewer wants to avoid the hazard. However, the warning alone can't do everything. The avoidance of the hazard must be arranged so that it has the lowest possible cost for the user. In part, this means not requiring unreasonable actions from the user, nor destroying the utility of the product by the procedures that have to be followed. Finally, the warning must also be durable, since if it's not there it can't be read.