The white Proesser buttons are not the same as "milk glass," as the  buttons 
were made by heat compression and the latter are melted and molded.  Also, I 
believe the 19th century ornamental milk glass is more opaque and  opalescent 
than the milkier 20th century glass. 
 
I have to laugh, as I attended a lecture a few weeks ago by a young woman  
who kept talking about a medicine jar with a funny name. Suddenly, it hit me she 
 was mis-pronouncing "Mentholatum" and I nearly burst out laughing. Carol 
Serr  sat behind me and leaned forward to say, "she is too young to know."
 
Ron May
Legacy 106, Inc.