Custom made glass shaving bowl

Would anyone have advice for having a custom made glass shaving bowl made, general size depth and should there be ridges inside as i have seen some ceramic bowls with this feature on the inside. A friend fires glass and my wife has asked her to make one for me.

Thanks
That sounds great, the ridges do help create a lather but a lather can be produced in a bowl without ridges. How about a bowl with little dots of glass on the inside ? Be sure to show us when you have had it made. :)
 
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