How to use Ceramic Marker (in Japanese)
   https://www.youtube.com/watch?v=Dp3asw0-KmM
     To start with, fill the nib with gold liquid. Push the nib slowly several times and wait for a while.
     In this video, a staff is painting on 3 plates to show its appropriate thickness of the liquid.
1st : too thin
2nd : appropriate
3rd : a bit too thick
     
 - 03:00  a bit too thin
      03:50-  appropriate, recommended thickness
      09:19-  fired
How  to exchange the nibs  (in Japanese)
https://www.youtube.com/watch?v=nPv79ErD1Kk&t=0s