Pipetting by mouth is strictly forbidden. The organizer provides a list of chemicals from which the chemicals used in practical preparatory and competition tasks are drawn. The list of chemicals must include information of the maximum amounts of materials needed or in the case of solutions their maximum concentrations. Any hazardous materials on the list must be accompanied by detailed instructions for safe handling. Each participating country has three months to file a substantiated dissent concerning the use of a special chemical.
Silence indicates acceptance.
The organizer should try to revise the list in order to satisfy any objections. The final revision of the list will be distributed to the delegation leaders at the start of the Olympiad. Hazard Warning Symbols and Hazard Designations and their explanation. They propose the methods of solution and the marking scheme. The tasks, their solutions and the marking schemes are submitted to the International Jury for consideration and approval.