Regarding the length of copper 1 and copper 2, copper 1 is 2 cm x 1 cm and copper 2 is 10 cm x 1 cm.
The numbers written in the results other than copper 1 and copper 2 are the numbers counted from the front.
This time, we conducted experiments with 5 types of disinfectants, and as a result, 2 types of washed copper and then carbonated water gave good results. From these, it is possible that citric acid and vinegar had too high a pH and damaged the flowers.
First of all, regarding the reason why the copper plate, which did not extend its life so much last time, extended its life, I used baking soda when wiping off fingerprints etc. on the copper plate last time. It is possible that the baking soda has exerted a bactericidal effect. In addition, there was an accident such as spilling, and the number of samples decreased. I will pay attention to these and carry out the third experiment.