This time, I left it for 2 days.
What kind of change is appearing?
There are places where it seems that no bacteria are generated at all.
- Before hand wash（dark place / room temperature）
- Before hand wash（dark place / refrigerator）
- Before hand wash（ＵＶ / slightly highter than room temoerature）
- After soap wash（dark place / room temperature）
Let's think!
What can we learn from the results of this experiment?
