If the ratio is above 3.8, it is very probable that Japanese or carnauba wax or grease has been added.
"Scientific American Supplement, No. 443, June 28, 1884" by Various
The Japanese tops are of several kinds, some are made of univalve shells, filled with wax.
"Child-Life in Japan and Japanese Child Stories" by Mrs. M. Chaplin Ayrton
The Japanese also go to their favourite tea gardens where bands play, and wax figures are sold.
"Threads of Grey and Gold" by Myrtle Reed
The Japanese Wax Tree in California.
"Scientific American, Vol. XXXIX.--No. 24. [New Series.], December 14, 1878" by Various