3:42 Cleaning coin is not always good because the value itself decreases. So, most coin collectors have never done that job although the surface of the coins became cleaner than before. But, it is a good job to understand the chemistry corrosion of alloyed metals through the experiment.
15:15 I never imagined that time could transform something so drastically.
Right. you got a point.
3:42 Cleaning coin is not always good because the value itself decreases. So, most coin collectors have never done that job although the surface of the coins became cleaner than before. But, it is a good job to understand the chemistry corrosion of alloyed metals through the experiment.
You can say that again.
4:27 What is that structure on the coin? Looks cool
One of the Korean National Treasures in Gyeongju where many international visitors have visited.
Thank you kind person
Thanks for your comment.
연구실 분위기가 화기애애해 보입니다
너무 좋아 보이네요
감사합니다. 많은 도움을 받고 있습니다.
Can you provide the korean-verson video
MAY will try to do accordingly. Thanks for your suggestion.
0:18 This person is so cute
Couldn’t agree more with you ^^
HaHa~~