I'm no button expert but this book from the 1850s says that metal shanks are inserted into the glass while the glass is still molten. http://books.google.com/books?id=mq1AAQAAMAAJ&pg=PA199&lpg=PA199&dq=how.metal+shanks+ate+applied+to+glass+buttons&source=bl&ots=l2gPfpIB6v&sig=wc2UroY24knwBbHQm1sK-8V1ckE&hl=en&sa=X&ei=VP4SVO6rG_XGsQSo4ILQCQ&ved=0CDEQ6AEwCA > On Sep 11, 2014, at 8:14 PM, Susan Walter <[log in to unmask]> wrote: > > Hi All, > Can someone tell me what was used to attach a metal shank (loop or box) to the button back surface? Some sort of glue? > > Many thanks, > S. Walter