.

 

below photo is normal lighting, engraving can't be seen

under lighting some engravings may be visible

it may take 1+ year(s) for the outer thick usushi layer to become clearer, then engraving will be much more easily seen

 

below photos are under very bright lighting (like sunlight)

 

engraved images for cap: mermaid, jellyfish, sea plants, dolphin

engraved images for barrel: dolphins, sea plants

 

red arrow: slight recess due to the deeply engraved features

 

red arrow: slight recess due to the deeply engraved features