PROBLEM NO.6 REVIEWER Team China Taking the stage: Zheng Luxiao

Problem Suggest a chemical formulation for the ink that would disappear after used to write a text. What parameters determine the time when the text becomes invisible? Is it possible to process the paper in such a manner that the text appears again?

Reporter’s expression pros cons Clear Structure Logical expression Quite fluent Clear experiment phenomena in forms of pictures Great teamwork! Failed to give complete answer to question

Reporter’s theory advantages disadvantages Qualitative analysis Reasonable simplification: focus on a few way to make “disappearing ink” Focuses on a few parameters Lack of quantitative analysis Missing some essential chemical formulas

Reporter’s experiments pros cons Reasonable experiment settings Good presentation of experimental procedure

opponent’s expression advantages disadvantages Organized expression Clear logic of raising questions Courteous demeanor

Opponent’s Overall Performance pros cons Grasped the essential issue Have a profound understanding on certain parameters Proper structure of the report

reviewer’s suggestion To the reporter: Complete solving the problem. Do some quantitative research.

THANKS FOR YOUR ATTENTION