What would happen if I engraved a pure black, glass plate with a ryoter? 

What would happen if I engraved a pure black, glass plate with a ryoter?
See what the work will be like.
▶Glass engraving workshop with Leuther：Workshop Procedures
　glassbook.shop-pro.jp/?mode=f16
This workshop requires a reservation.
Klook　
www.klook.com/en-GB/activity/...
On that day , if there are vacant seets ,you can try this workshop!
Price for glass & Lesson fees ＆ TAX Total is about ￥3000-　
You can use credit cards.

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