Cryogenic liquids, please do not touch the warning signs

Cryogenic liquids, it is strictly forbidden to touch warning signs:

General warning signs are used when other standard signs cannot express dangers, obstacles or road conditions. It is usually a triangular sign with an exclamation point, and below it is a sign in the local language explaining the danger, obstacle or condition. In countries where the diamond is used as the standard warning sign shape, the explanatory text will be written directly on the sign, or it may only be marked with simple text such as "Caution", or it may be accompanied by auxiliary explanatory signs.